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.
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