The Master Grande Tradition series epitomises Jaeger-LeCoultre’s horological ingenuity and artistic creativity, bringing innovations and complications together in fascinating new ways. As the latest addition to this series, the new Master Grande Tradition Calibre 945 harnesses more than a century and a half of accumulated expertise. This masterpiece of mechanical engineering incorporates two of the most romantic yet technically challenging complications in horology – a minute repeater and a celestial vault. The complex mechanism is further elevated by an orbital flying tourbillon. This limited edition of eight pieces each in rose gold and in white gold features a new aesthetic that reaffirms Jaeger-LeCoultre’s mastery of the artistic crafts.

A MINUTE REPEATER FOR THE MODERN AGE

Considered by watchmakers to be the most challenging – and rewarding – of all horological complications to master, a minute repeater is not only a timepiece but also a miniaturised musical instrument. The technical difficulty of creating one lies in the complexity of the mechanism needed to transcribe the precise time shown by the hands into a series of perfectly programmed strikes. The artistic challenge lies in ensuring that those strikes produce a sound that is rich, harmonious, pure and clearly audible.

Over the past 150 years, minute repeaters have had a major presence in Jaeger-LeCoultre’s portfolio of complicated timepieces. La Grande Maison’s mastery of chiming watches is confirmed by more than 200 calibres, including some 100 minute repeaters made before the year 1900. Since the mid-1990s, when Jaeger-LeCoultre revived this noble horological legacy, its engineers and designers have worked to redefine the benchmark for acoustic quality, harnessing technology to serve and safeguard horology’s most treasured traditions.

One of the most important elements of a chiming watch is the way in which sound is transmitted from within the watch to be heard by the human ear. Capitalising on the superior acoustic qualities of synthetic sapphire crystal, Jaeger-leCoultre’s patented ‘crystal gongs’ (introduced in 2005) are soldered directly to the sapphire crystal, which acts as an amplifier. The square-profile gongs introduced two years later provide a flat striking surface for the hammers, ensuring more consistent and powerful strikes, while the additional material provides a greater vibrational mass and thus a fuller sound. The articulated trebuchet hammers (introduced in 2009) use a similar mechanical principle to the medieval counterweight catapults that they are named after, greatly improving the speed and force of the hammer strike.

Even the most beautiful chime can be marred by background noise – a problem that Jaeger-LeCoultre resolved 125 years ago, with its patented silent strike governor. Using centrifugal forces to regulate chiming, it eliminates the background buzz characteristic of older striking mechanisms. Recognised as a benchmark, it is now used in almost all chiming watches of the Grande Maison.

A HEAVENLY DISPLAY

The new Master Grande Tradition Calibre 945 embodies Jaeger-LeCoultre’s mastery of astronomical complications in its celestial vault complication, which defines the dial of the watch.

Jaeger-LeCoultre first brought together the technical innovations of its new-generation minute repeaters with an astronomical display in the original Master Grande Tradition Grande Complication of 2010. That watch also introduced the Orbital Flying Tourbillon, integrating it into the mechanism as a regulating device.

As well as turning on its own axis in 60 seconds, the tourbillon makes a complete, anti-clockwise circuit of the dial in one sidereal day. Slightly shorter than a solar day (on which we base civil timekeeping), a sidereal day is based on Earth’s rotation measured relative to the ‘fixed’ stars, which takes precisely 23 h, 56 min and 4.1 seconds. The sidereal day is used by astronomers to follow the apparent movement of the stars across the night sky.

A golden sun-shaped pointer set at the edge of the disc of constellations indicates the date, the month, and the signs of the Zodiac, as well as the 24-hour scale that is marked on the inner flange of the dial. Civil time is read on the two concentric rings that complete the dial: applied hour indexes on the first ring and minutes on the silvery-white outer ring.

AESTHETIC

An exceptional movement merits an exceptional habillage and the new Master Grande Tradition Calibre 945 brings fresh artistic expression to this marriage of complications. Reaffirming Jaeger-leCoultre’s expertise in design and mastery of artistic crafts, the timepiece is offered in two versions: one marries the warm glow of pink gold to a black dial, while the other combines deep blue tones with the coolness of white gold and the discreet sparkle of baguette-cut diamonds, which are set on the bezel.

A multiple-level dial amplifies the beauty of the celestial theme while also showcasing the orbiting tourbillon. On the deepest level of the dial, a midnight blue or black disc (depending on the model) is decorated with tiny stars. Above it, a delicate filigree forms a dome, its structure echoing the pattern of the constellations marked on the convex celestial disc. The star chart depicts the Northern Hemisphere night sky, as seen from the 46th parallel – the latitude of Jaeger-LeCoultre’s home in the Vallée de Joux.

The new Master Grande Tradition case, introduced in 2019’s two minute repeaters, is a perfect complement to the artistry of the dial and the sophistication of the movement. Comprising more than 80 parts, its convex bezel is complemented by broad bevels on the lugs; the hollowed-out sides of the lugs add dynamic tension, while the repeater slide is tapered to harmonise beautifully with the curving case sides. Different surfaces are microblasted, polished and satin-brushed to maximise the play of light and emphasise the details.

In every sense, the new Master Grande Tradition Calibre 945 is testament to Jaeger-LeCoultre’s enduring expertise in chiming watches and its dedication to maintaining the fine balance between a passionate drive to innovate and profound respect for tradition.

TECHNICAL CHARACTERISTICS

Dimensions: 45 mm

Calibre: manual mechanical movement, Jaeger-LeCoultre Caliber 945

Functions: hours/minutes, month, 24-hour indication, orbital flying tourbillon indicating the sidereal time, minute repeater with cathedral ‘crystal gongs’ soldered directly to the sapphire crystal, celestial disc with star chart indicating the constellations in the north hemisphere

Power reserve: 40 hours

Case: satin, micro-blasted and polished finishes, pink gold or white gold with bezel set with baguette-cut diamonds (44 diamonds – 3.76 carats)

Dial: black dial with golden laser welded structure (pink gold version) or blue dial with silvered laser welded structure (white gold version)

Case back: open

Water resistance: 5 bar

References: Q5262460 (pink gold version, limited to 8 pieces), Q5263480 (white gold version, limited to 8 pieces)

In 2013, Jaeger-LeCoultre first introduced the Master Grande Tradition Gyrotourbillon 3 to mark the Maison’s 180th anniversary. Combining a third-generation interpretation of the Gyrotourbillon with an intriguing and highly unusual instantaneous digital display chronograph, it represents mechanical sophistication of the highest order.

But still, Jaeger-LeCoultre wanted to do more. And so, this new version of Gyrotourbillon 3 harnesses the exceptional skills of the Manufacture’s Rare Handcrafts™ (Métiers Rares®) artisans to elevate the rare and precious timepiece to a new level. With various elements of the dial showcasing the traditional Rare Handcrafts™ of hand-guillochage, engraving and grand feu enamel, this new model introduces the rarely seen craft of meteorite inlay.

On the dial side, the intriguing geometric markings of the silvery-grey meteorite are complemented by the subtle glitter of deep blue aventurine and the glow of pure white grand feu enamel. This harmonious interplay of materials, colour and surface pattern is complemented by the warmth and richness of the pink gold case and dial details.

Found in Namibia, the Gibeon meteorite chosen for this watch is an iron-nickel alloy with an octahedrite crystal structure, formed by the cooling of the asteroid fragment in outer space over the course of billions of years before it crashed to earth in prehistoric times. The abstract geometric patterns of the intersecting crystal structures shimmer gently when the material catches the light, their irregular arrangement making every slice of meteorite subtly different from all others.

In addition to the meteorite inlaid on the German silver bridges, a disc of meteorite sits at the centre of the time display dial, surrounded by a ring of aventurine with applied indexes. On the chronograph display, an aventurine disc is encircled by a ring of white grand feu enamel, marked with elapsed seconds. The Day/Night display comprises a 24-hour plate on which two gold semi-circles are applied, one each for day and night. The white day section is decorated with hand-guilloché, hand-engraved sunrays and an applied polished pink gold sun; the night section features applied polished pink gold crescent moon and stars, set on a rich blue background.

Asymmetrical yet perfectly balanced, these three overlapping dials are layered, adding visual depth to the watch face – and, despite tempting glimpses of the movement, drawing the eye irresistibly to the tourbillon as it spins in space, with no immediately visible means of support.

It is on the back of the movement that the meteorite truly takes centre stage. A lively yet subtle mixture of colour and texture – blued screws, ruby jewels, the shiny aspect of the hand-chamfered and hand-polished jewel countersinks, bridges and plates, and the matt finish of the brushed borders of the German silver plates – offsets the abstract geometric patterns of the meteorite, which adorns all of the plates and bridges.

A skill mastered by very few craftsmen in the world, meteorite inlay requires a rare degree of precision and dexterity. First, the artisan must hollow out the surface of the German silver plate or bridge, to a depth that exactly matches the thickness of the meteorite fragment, leaving only a fine fillet of German silver at the borders. Once the new surface has been polished, the meteorite must be laid so that its edges fit seamlessly within the complex, curving borders and its surface lies exactly flush with them, to form a completely flat and unified plane. It is work of the utmost refinement and precision, measured in fractions of a millimetre.

Such exacting work complements the remarkable precision of the Gyrotourbillon mechanism. Exceedingly rare and complex, this multi-axis tourbillon comprises two cages, set at two different angles, turning opposite directions, at different speeds, with a blued spherical balance spring beating like a heart in their centre. In the absence of a tourbillon bridge, the cantilevered all-aluminium cages of Gyrotourbillon 3 appear to be suspended in space.

Hand-wound movement, calibre 176, incorporates a fully integrated chronograph, which displays the seconds on a traditional round dial and elapsed minutes on an instantaneously jumping digital counter.

Conceived and crafted for true connoisseurs of art and mechanics, the new Master Grande Tradition Gyrotourbillon 3 ‘Meteorite’ represents the highest expression of Jaeger-LeCoultre’s codes.

Technical characteristics:

Dimensions: 43.5 mm

Thickness: 15.8 mm

Calibre: manual mechanical movement, Jaeger-LeCoultre Caliber 176

Functions: digital instant monopusher chronograph, hours/minutes, day/night indicator, gyrotourbillon

Power reserve: 45 hours

Case: pink gold

Dial: aventurine, white enamel, meteorite, hand-guilloché day/night indicator

Caseback: open

Water resistance: 50 m

Reference: Q5032441

Limited to 8 pieces

This year, la Grande Maison brings the brilliance of a star-studded night sky down to mingle with the more earthbound constellations found on the red carpet of the Mostra. A new edition of the Master Grande Tradition Tourbillon Céleste, will be presented during the 76th edition of the oldest film festival in the world, scheduled for 28 August to 7 September 2019.

The best films can redefine the most quotidian experiences, elevating life to art. In line with this approach, the Jaeger-LeCoultre Master Grande Tradition Tourbillon Céleste features a different perspective on time itself, with an orbital flying tourbillon that makes a complete turn of the dial over the course of 23 hours, 56 minutes and 4 seconds. This unusual time unit is the length of one sidereal day, calculated with reference to the more distant stars instead of the Sun.

The dial itself depicts the night sky of the Northern hemisphere, showcasing the constellations of the zodiac calendar framed by an outer ring displaying their associated symbols. A tiny gold marker, seen just beyond the orbit of the flying tourbillon, revolves around the dial annually, an indication of where we are within this alternative and ancient star calendar.

Differentiating this model of the Master Grande Tradition Tourbillon Céleste from previous versions is its contemporary and arresting new design. At first glance, the dial has been simplified in terms of textures and indications, but it has in fact gained an additional dimension which is visible only in low light. The hour markers and constellations have been filled with Super-LumiNova™, evoking the glow of heavenly bodies on a clear night.

An elegant and contemporary case, part of the new generation of case design set by this January’s Master Grande Tradition Gyrotourbillon Westminster Perpétuel, encloses the 334-component calibre 946 of the Master Grande Tradition Tourbillon Céleste. A complex blend of surface textures, from satin finish to micro-blasting and mirror polish, comes together in a 43mm white-gold case that perfectly complements the deep blue dial and the roseate hue of the constantly beating gold balance wheel.

In both its mechanical and aesthetic aspects, the Master Grande Tradition Tourbillon Céleste takes us beyond the everyday. It is the rare timepiece that captures the rhythms of daily life in parallel with the movements of the universe.

An Affinity for the Extraordinary

Jaeger-LeCoultre has developed unparalleled expertise in a wide range of horological métiers since it was founded in Le Sentier in 1833. Today, the Manufacture Jaeger-LeCoultre practices no fewer than 180 watchmaking and watch-related skills in its Vallée de Joux facility, many of them honed over decades and enhanced by in-house innovation.

The orbital flying tourbillon featured in the Master Grande Tradition Tourbillon Céleste was first seen in the 2010 Master Grande Tradition Grande Complication, a chiming masterwork that exemplifies the savoir-faire of Jaeger-LeCoultre and its role in expanding the field of high complication.

The flying tourbillon is uniquely combined with yet another area of mechanical watchmaking dominance for Jaeger-LeCoultre — the sidereal indication of time, which appears in both masculine and feminine collections of La Grande Maison.

Technical characteristics:

Dimensions: 43 mm

Calibre: manual mechanical movement, Jaeger-LeCoultre Caliber 946

Functions: Hours/Minutes, Zodiac calendar, 24-hour civil time, Month, Orbital Tourbillon, Skychart

Power reserve: 45 hours

Case: white gold

Dial: deep blue with Super-LumiNova™ treatment displaying the celestial bodies at night

Water resistance: 50 m

Case back: Open

Reference: Q5273480

Limited to 28 pieces

This second chapter under the theme “The Art of Precision” was unveiled for 2019 in Japan. It’s no accident that the Manufacture elected to set the event in the impressive city of Kyoto, known for its special atmosphere, beautiful architecture, and finely wrought craftsmanship that relies on precision in action.

The Home of the Art of Precision

This event provided a unique opportunity to discover the powerful bond linking Japan’s former Imperial capital to the Grande Maison, uniting them around a common preoccupation with precision. For Jaeger-LeCoultre, this ceaseless quest ranges from the technical precision of a movement – intended to tell the time, as well as giving more complex indications – to the precision of the strictly controlled gestures and artistic rigour of the 180 specialised trades and Rare Handcrafts "Métiers Rares®" perpetuated by our artisans under one roof. The Japanese arts have strived to meet this calling and challenge for centuries, with the same rigour and extreme attention to detail.

A living, vibrant testimony

The evening showcased some of the most highly regarded watchmaking skills and applied art techniques in the world, mastered by Japanese Living National Treasure artists: Mr. Kiju Fukuda, Mr. Kenji Suda and Mr. Kazuo Yamagishi. Alongside these artists were two Jaeger-LeCoultre watchmaker and enameller artisans, who travelled from the Vallée de Joux especially for the event. Not only watchmaking precision, but also enamelling – a centuries-old decorative technique reintroduced at the Manufacture in 1999 – drew parallels with the secrets of Japanese embroidery and marquetry, skills that were presented along with a number of rare and precious objects. Guests got a fascinating insight into genuine works of art which, like Jaeger-LeCoultre watches, require many hours, if not months, to craft.

The power and beauty of extreme precision

A similarly exacting degree of precision gave rise to the new limited edition watch that the Manufacture is honoured to present to you in an exclusive preview, the Master Grande Tradition Répétition Minutes Perpétuelle. Drawing inspiration from the aesthetic codes of the celebrated Master Grande Tradition Collection, this new masterpiece confirms Jaeger-LeCoultre’s expertise in the field of chiming watches. Its innovative gong system was designed to reproduce the idealised chime made by antique chiming pocket watches, with a rich acoustic clarity rarely attained in Grand Complication watches. Housed in a highly compact (13.72 mm) white gold case that optimises the wearer’s experience, this exceptional timepiece represents the next generation of chime-related innovation, both in terms of mechanical innovation and miniature decorative arts. The truth of this is evident from just one glance at the two dial variations available for this watch – one a neoclassical silver-grained dial and the other a deep blue translucent guilloché enamel dial.

Under the bright night-time lights of Kyoto, city of art and history, Jaeger-LeCoultre had the immense pleasure of paying homage yet again to the precision that has guided every gesture of its master watchmakers and artisans since 1833. This precision in both technique and aesthetics mirrors that same rigour that has been practised for thousands of years in Kyoto – a city of particularly emblematic status in Japan, that is highly esteemed by lovers of beautiful objects and heritage pieces.

Catherine Rénier, CEO of Jaeger-LeCoultre:

“We are delighted to present our collection of watches dedicated to Art of Precision in the city of Kyoto, known for its uniquely refined atmosphere and heritage. Resembling a perfectly executed theatre act, where the role of precision is of utmost importance: in nature, in architecture, in culture and customs. Precision everywhere and all around …. Precision is the common denominator between the city of Kyoto and the Jaeger-LeCoultre Manufacture dedicated to watchmaking savoir-faire and technical expertise since 1833 in the Vallée de Joux. It was a perfect opportunity to immerse our guests in the Art of precision theme, paying attention to detail, and traditional gesture accomplished to create piece of arts, as our collection of watches.”

With close to two centuries of horological expertise, Jaeger-LeCoultre stands alone in its command of complicated watchmaking. This includes unparalleled in-house experience in chiming watches, the most prestigious and exalted domain of mechanical savoir-faire. As a matter of fact, La Grande Maison du Sentier has the distinction of being the only manufacture in the world to have over 200 chiming watch calibres in its historical and modern inventory.

In May 2019, following the success of the Master Grande Tradition Gyrotourbillon Westminster Perpétuel at the Salon International de la Haute Horlogerie (SIHH), Jaeger-LeCoultre debuts a timepiece that once again brings new levels of excellence to its mastery of chiming watches.

The Master Grande Tradition Répétition Minutes Perpétuelle features an innovative gong system that resurrects the idealised chime of antique pocket sonneries, paired with an evolutionary case design that transmits timelessness and modernity.

Key points of the Jaeger-LeCoultre Master Grande Tradition Répétition Minutes Perpétuelle

• A new gong system that replicates the richness and strength of antique sonnerie pocket watches
• Evolutionary case design that redefines the timelessness and modernity of the Master Grande Tradition timepieces
• Heightened focus on customer experience with automatic winding system and intuitive perpetual-calendar setting

A new chime

Innovation in the domain of chiming watches has been one of the foundation stones of mechanical expertise at Jaeger-LeCoultre since 1895, when the company was awarded a patent for the world’s first silent strike regulator. In the 21^st century, Jaeger-LeCoultre channelled its creativity in sonnerie watches towards producing the most energy-efficient and volume-optimised chime possible.

The Master Grande Tradition Répétition Minutes Perpétuelle represents the next generation of chime-related innovation at La Grande Maison. Its movement, the automatic calibre 950, unites the two apex values of chime quality that were previously thought to be incompatible — power and beauty. This combination of qualities has largely eluded the best watchmakers in history, the understanding being that one can come only at the cost of the other.

The research and innovation team of Jaeger-LeCoultre have achieved this idealised chime by creating an entirely novel gong configuration, unlike any other. Instead of lying flat in overlapping coils like the most commonly seen minute repeater gongs, the gongs of the Master Grande Tradition Répétition Minutes Perpétuelle depart radically from convention by incorporating unprecedented height and space. Two gongs, welded together at their base, travel in the same direction around the periphery of the movement, making one near-complete tour before dramatically arching upwards, traversing the entire height of the movement. They then diverge and take a terminal semi-arc around the other side of the movement, stopping just before their ends meet.

By maximising the space occupied by the element that creates sound vibrations — the gongs — the calibre 950 boosts its capacity for sound transmission. Further increasing this capacity is the proximity of the gongs to a larger proportion of the watch case, according to the acoustic principles that instinctively guide us where to position a relatively weak audio source in relation to an resonator (such as when a personal music player is placed in a glass dish to amplify the sound).

Signature chime innovations of Jaeger-LeCoultre, such as the square gong cross-sections and the articulated “trebuchet” hammers, ensure that the gongs are struck with the greatest possible impact and the least interference from hammer recoil. These set the stage for the meticulously engineered acoustic profile of the Master Grande Tradition Répétition Minutes Perpétuelle chime.

The lower-pitched gong takes a helical path from gong heel to tip. Though irregular in shape, its unidirectional flow allows it to vibrate in a way that creates the harmonic overtones giving fullness and balance to bass notes.

The higher-pitched gong switches direction, effectively folding back on itself like the tines of a tuning fork. This configuration emphasises the fundamental vibration of the gong, producing a purer tone that imparts the clarity and brilliance prized in treble notes.

This new optimised combination of chime volume and acoustic quality marks out new territory for Jaeger-LeCoultre in sonnerie watches, an expansion that is fully supported by the other customer-centric aspects of the Master Grande Tradition Répétition Minutes Perpétuelle.

Focus on the wearer

Perpetual calendars are among the most practical and useful mechanical complications that can be incorporated into a timepiece. Their ability to display the correct calendar information, taking into consideration the varying lengths of the months — even during leap years — provides everyday convenience for the wearer, especially when combined with an automatic winding system for low-maintenance upkeep when worn regularly.

Traditional-style perpetual calendars are mostly hand-wound, as the prestige of a high complication generally demands that the finely finished movement should be fully visible for admiration. Automatic minute repeaters are even rarer, with occasional exceptions such as the Jaeger-LeCoultre Master Ultra Thin Minute Repeater Flying Tourbillon and the Jaeger-LeCoultre Rendez-Vous Ivy Minute Repeater.

The winding rotor of the calibre 950 is hidden within the movement, positioned between the perpetual calendar and minute repeater mechanisms, in order to a have full view on the mechanism at the back of the watch. The Master Grande Tradition Répétition Minutes Perpétuelle is thus continuously supplied with energy without the need to obscure a single finely finished component, whether chamfered, satin-finished, decorated with côtes de Genève, or any combination of the above.

Another feature of the watch that puts the needs of the wearer foremost is the intuitive Security zone that appears in a dial aperture near the axis of the hour and minute hands. This indication appears between the hours of 10pm and 1am, when adjusting the time or calendar is not advised due to the possibility of stressing or even damaging the movement. This reminder takes the onus off the wearer to remember when the time and calendar indications can be adjusted.

Despite the multiple complications and the automatic winding system, all of which are known to add bulk to a timepiece, the Master Grande Tradition Répétition Minutes Perpétuelle is highly compact, with a diameter of 43mm and a height of 13.72mm.

Design evolution

The Master Grande Tradition collection has always been a platform for high watchmaking at Jaeger-LeCoultre, emphasising classic design in order to let the sophisticated mechanisms take centre stage. In the Master Grande Tradition Répétition Minutes Perpétuelle, Jaeger-LeCoultre recalibrates the balance of technical prowess against aesthetic refinement to arrive at a new equilibrium of power and beauty.

A new case, comprising more than 80 separate hand-finished parts, was created for the Master Grande Tradition Répétition Minutes Perpétuelle. Particular attention was paid to the ergonomics of the case, from the deeply convex bezel and broad bevels on the lugs to the smoothly tapered minute repeater slide.

Parts are alternately polished, satin-finished or sandblasted, the latter being highly challenging to execute on the exterior segments of a watch. The extremely porous surface of a sandblasted component causes it to easily pick up oils from even the slightest contact with human skin, leaving a mark that can be seen as unsightly (though easily removed) blemish. In its finishing and Métiers Rares ateliers, Jaeger-LeCoultre has perfected the technique of applying a sandblasted finish that is resistant to such oil transfer.

The Master Grande Tradition Répétition Minutes Perpétuelle comes in two dial variations, a neoclassical silver-grained dial and a deep blue translucent guilloche enamel dial that is produced by hand in the Atelier des Métiers Rares.

A dial of solid white gold is first decorated with guillochage on century-old rose engines, each round of guilloché work repeated several times in order to achieve the correct depth of engraving. The perpetual calendar counters are then precision laser-welded onto the dial, before the remaining spaces are filled with translucent enamel in another multi-stage process. The enamel is then polished, resulting in the final dial of shimmering vitreous blue that changes in hue with the light and angle.

The Jaeger-LeCoultre Master Grande Tradition Répétition Minutes Perpétuelle is the result of 149 years of experience in sonnerie timepieces, combined with an unparalleled patrimony in mechanical innovation and the most exalted levels of miniature decorative arts. With this latest masterpiece, La Grande Maison du Sentier recommits itself to furthering the frontiers of 21st-century watchmaking.

Master Grande Tradition Répétition Minutes Perpétuelle

Dimensions: 43 mm

Thickness: 13.72 mm

Calibre: 950 – Automatic

Case: White gold

Water resistance: 5 bar

Functions: Hours/Minutes, Minute repeater, Perpetual calendar (Day, Date, Month, Moon phase, Year)

Power reserve: 38 hours

Dial: Blue guilloché enamel / Silver grained

Case-back: Open

Reference: Q52334E1 (Limited to 30 pieces), Q5233420 (Limited to 30 pieces)

Key points of the Jaeger-LeCoultre Master Grande Tradition Gyrotourbillon Westminster Perpétuel

• The fifth multi-axis tourbillon from Jaeger-LeCoultre, with a size reduction in the redesigned tourbillon component to create a more wearable watch
• A Westminster carillon minute repeater that replicates the chime of the famed Big Ben clock tower in London, with a silence-reduction mechanism to optimise melody cadence
• Incorporates a one-minute constant-force mechanism to provide consistent energy to the sensitive tourbillon, resulting in a precisely jumping minute hand and a more precise minute repeater mechanism
• A sleek new contemporary aesthetic that pairs traditional haut-de-gamme finishing with modern, wearable watches at the top of the mechanical watchmaking hierarchy

JANUARY 2019 — The Master Grande Tradition Gyrotourbillon Westminster Perpétuel is the latest generation of multi-axis tourbillon to emerge from Jaeger-LeCoultre, following the 2004 Master Gyrotourbillon 1, the 2008 Reverso Gyrotourbillon 2, the 2013 Master Grande Tradition Gyrotourbillon 3 Jubilee and the 2016 Reverso Tribute Gyrotourbillon.

Precision tourbillons are a noted speciality of Jaeger-LeCoultre, as proven by the 2009 Concours International de Chronométrie timing competition, in which the top two prizes were awarded to Jaeger-LeCoultre. The strength in creating high-precision tourbillons goes hand-in-hand with the mastery required to engineer the visually spectacular Gyrotourbillon watches. Even with the considerable energy demands of the large multi-axis tourbillon, chronometric performance must not be affected. Reconciling the needs of the Gyrotourbillon with impeccable chronometric requirements is a balancing feat that can only be accomplished with the experience and skill of a 186-year-old watchmaking manufacture.

Further advancing the art of multi-axis tourbillons, the Master Grande Tradition Gyrotourbillon Westminster Perpétuel features a tourbillon that is significantly smaller than those in the preceding Gyrotourbillon timepieces. As a rule, reducing the size of a mechanism also reduces its error tolerance, which is why successful miniaturisation efforts are so highly valued and complex. In creating a smaller tourbillon, Jaeger-LeCoultre has created a truly wearable Gyrotourbillon, bringing high complication out of the watch safe and onto the wrist for everyday enjoyment.

The Westminster chime is familiar to everyone as the famous melody of the Big Ben clock at the Palace of Westminster in London. Its four-phrase melody is composed of four notes played in different sequences and different quantities at each quarter of the hour. The Master Grande Tradition Gyrotourbillon Westminster Perpétuel uses four sets of gongs and hammers to create the Westminster chime to indicate the quarters when the minute repeater is activated, incorporating a complex mechanism that places it at the most prestigious tier of chiming watches.

The most beautiful chime can be marred by interruptions and gaps of silence between the strikes. In order to create a chime of unmatched euphony, the Master Grande Tradition Gyrotourbillon Westminster Perpétuel has a silence-reduction function built into its chiming mechanism. This ensures that even when the full set of Westminster quarters is not struck, there is no time delay corresponding to the missing quarters before the minutes are struck. In every instance of the chime when the Master Grande Tradition Gyrotourbillon Westminster Perpétuel is activated, the hour strikes, quarter strikes and minute strikes are seamlessly joined.

Precision lies at the heart of the Master Grande Tradition Gyrotourbillon Westminster Perpétuel, with a one-minute constant-force mechanism that provides a consistent level of power for the energy-hungry tourbillon without affecting its chronometric ability. The constant-force mechanism consists of a spring, known classically as a remontoir d’égalité, that is periodically re-armed by the mainspring and acts as a secondary power source to protect the regulating organ of the movement.

In the Master Grande Tradition Gyrotourbillon Westminster Perpétuel, the constant-force mechanism has an additional advantage. It regulates the motion of the minute wheel, creating a jumping minutes hand that offers greater precision in time display. More significantly, the mechanism that controls the minute strike also follows this one-minute jumping system, which completely eliminates the chiming error that can occur when the repeater is activated between minutes, when the chime played and the time shown can be one minute apart.

Besides the multi-axis tourbillon, which highlights the cinematic virtuosity of fine watchmaking at Jaeger-LeCoultre, and the minute repeater, which showcases in-house mastery of the most sophisticated complications, the Master Grande Tradition Gyrotourbillon Westminster Perpétuel also features the one horological function with the greatest everyday relevance and pragmatic value — the perpetual calendar. As the name suggests, the perpetual calendar is designed to work in perpetuity. It automatically displays the correct date without the need for manual adjustment between months of different lengths. It even takes into account the extra day at the end of February during leap years. The most common configuration of the perpetual calendar mechanism can only be adjusted in one direction, but the Master Grande Tradition Gyrotourbillon Westminster Perpétuel emphasises the experience and convenience of the user, and its date can be adjusted forwards or backwards without harming the movement. The pointer-style date indication further reinforces the precision aspect of the timepiece, as it jumps over the tourbillon aperture in order to provide the best possible view of the visually stunning rotating escapement.

The Master Grande Tradition Gyrotourbillon Westminster Perpétuel is the result of 186 years of fine watchmaking expertise and a spirit of innovation that continues to this day. Reflecting the blend of patrimony and modernity is the design of the watch, which emphasises the round profile of the Master Grande Tradition case. A retractable minute repeater pusher, first seen in the Master Ultra Thin Minute Repeater Flying Tourbillon, preserves the smooth lines of the case. Hand guillochage, fine hammering (martelage) and grand feu enamel are part of the canon of fine watchmaking finish and have been practiced at Jaeger-LeCoultre throughout its history — most outstandingly in the dazzling Hybris Artistica collection. In the Master Grande Tradition Gyrotourbillon Westminster Perpétuel, however, these finishes are expressed in a subtle and contemporary way, culminating in the openworked dial — produced either in a striking deep-blue grand feu enamel or in a more classic silver-grained version — showcasing the mesmerising multi-axis tourbillon. These age-old techniques are skilfully practised by master artisans from the in-house Metiers Rares atelier of Jaeger-LeCoultre, where haut-de-gamme traditional finish is also applied to the movement by hand.

The Sound of Precision

There are extremely few watchmaking manufactures that possess in-house expertise in sonnerie wristwatches. There are even fewer that have been making them since 1870, accumulating one and a half centuries of experience and savoir-faire. There is only one watchmaking manufacture in the world that has over 200 chiming watch calibers in its historical and modern inventory — La Grande Maison du Sentier.

The Master Grande Tradition Gyrotourbillon Westminster Perpétuel brings together a panoply of chiming innovations and improvements that were first debuted by Jaeger-LeCoultre, representing the epitome of horological creativity and ingenuity at La Grande Maison.

In the 19^th century, repeater chimes were regulated primarily by an anchor-and-flywheel mechanism, which resulted in a characteristic buzz that can be heard underlying the chime of antique repeaters and some modern watches that still use the old system. Jaeger-LeCoultre patented a new silent strike governer in 1895 that uses friction and centripetal forces to regulate chiming. Today, this mechanism is used in the majority of chiming watches, including the Master Grande Tradition Gyrotourbillon Westminster Perpétuel.

The minute repeater of the Master Grande Tradition Gyrotourbillon Westminster Perpétuel also benefits from more recent innovations, such as the patented crystal gongs that first appeared in the Master Minute Repeater Antoine LeCoultre in 2005. These crystal gongs were welded to the dial crystal of the watch, capitalising on the superior sound transmission qualities of synthetic sapphire crystal to produce the loudest and clearest wristwatch chime ever created. Trebuchet hammers, articulated and sprung to deliver strong and quick strikes to the gongs, can be found in the Master Grande Tradition Gyrotourbillon Westminster Perpétuel, as they first appeared in the only other Westminster chime wristwatch of Jaeger-LeCoultre, the 2009 Hybris Mechanica Duomètre à Grande Sonnerie. Gongs with circular cross sections are the norm in minute repeater watches, but the square cross-section gongs seen in the Master Grande Tradition Gyrotourbillon Westminster Perpétuel are engineered to provide the greatest area of contact with the striking hammers, and have been a mainstay of Jaeger-LeCoultre chiming watches since 2006.

The Whirlwind of Precision

Of utmost importance in any watch movement is the regulating organ, the balance and hairspring assembly that allows a watch to measure time in precise beats. The tourbillon is a chronometric amplifier that can improve the timekeeping performance of a regulator by averaging out its positional errors. The in-house expertise of Jaeger-LeCoultre in tourbillons is unmatched, extending over a range of rotating escapements from the award-winning classic tourbillon calibre 978, the unbridged flying tourbillon, the various multi-axis Gyrotourbillon watches, the inclined-axis Sphérotoubillon and the groundbreaking flying tourbillon with flying balance in the Master Ultra Thin Minute Repeater Flying Tourbillon.

Along with this unparalleled variety of tourbillons comes an equally profound understanding of hairspring technology, which Jaeger-LeCoultre has developed with its own in-house tools to form the sophisticated spherical hairsprings used in some of its most evolved tourbillon watches.

The Master Grande Tradition Gyrotourbillon Westminster Perpétuel takes this exploration of precision to a new level with its constant-force mechanism. With the inclusion of the constant-force spring remontoir, the focus on precision is expanded far beyond the whirling dimensions of the tourbillon and its precision regulation. The Master Grande Tradition Gyrotourbillon Westminster Perpétuel constant-force mechanism highlights the precision of power delivery in one-minute cycles, the precision of time display in the jumping minutes hand and the precision of the repeater chime.

Master Grande Tradition Gyrotourbillon Westminster Perpétuel

Dimensions: 43 mm

Thickness: 14.08 mm

Calibre: 184 - Manual

Case: White gold

Water resistance: 3 bar

Functions: Hour/Minute, Jumping Date, Two-way perpetual calendar (Day/Date/Month/Year), Gyrotourbillon, Minute repeater with Westminster chime

Power reserve: 52 h

Dial: Blue guilloché enamel or Silver grained

Case Back: Open

Limitation: 18 pieces

Reference: Q52534E1, Q5253420