Driven by Jaeger-LeCoultre Calibre 978, the Master Tourbillon laid a prestigious milestone in the history of horological accuracy by winning the Chronométrie 2009 International Timing Competition organised by the Watch Museum of Le Locle. The Grande Maison now proudly presents a new model equipped with this already legendary calibre, the Master Grande Tradition à Tourbillon. This timepiece brilliantly combines the traditional know-how of a Manufacture dedicated to the quest for precision since its founding in 1833, and a spirit of innovation illustrated by the development of avant-garde technical solutions. Featuring a 43 mm case crafted in platinum or pink gold and an understatedly elegant design that has become the hallmark of Jaeger-LeCoultre creations, the Master Grande Tradition à Tourbillon embodies the triumph of precision expressed in an inimitably legible manner.
Three models and an exceptional calibre
Having been inducted following its recent victory into the high-precision movement hall of fame, Calibre 978 – one of the 1,000 calibres developed and produced by Jaeger-LeCoultre – no longer powers the distinguished Master Tourbillon alone, but now also beats at the heart of two other horological creations bearing the prestigious signature of the Manufacture: the Master Grande Tradition à Tourbillon and the Master Date Tourbillon 39.
Its technical characteristics epitomise the results of Jaeger-LeCoultre’s ongoing research. The engineers have developed a tourbillon carriage made from a light yet robust titanium alloy and weighing just 0.28 grams. This means very little energy is required to maintain the rotations of the tourbillon and its ultra-light carriage. The energy from the barrel can thus be entirely used to keep the large-sized variable-inertia balance oscillating at a frequency of 28,800 vibrations per hour and thus guaranteeing an exceptional degree of precision. In keeping with fine watchmaking traditions, the parts of this calibre are meticulously decorated by hand. The openworked oscillating weight in 22-carat gold, which guarantees a comfortable 48-hour power reserve when the mechanism is fully wound, bears inscriptions relief-engraved using the time-honoured technique of punch embossing. The elegant and refined Master Grande Tradition à Tourbillon now appears in an harmonious 43 mm-diameter case that highlights the majestic stature of an exceptional tourbillon enthroned on its generously sized dial. It is available in two versions: one in pink gold; and the other in a 200-piece platinum limited edition in tribute to the memorable first prize won in the 2009 Chronométrie timing competition and bearing the dial inscription “tourbillon chronométrie”. Its functions include a dual time-zone display, a 24-hour indication as well as a pointer-type date displayed on a graduated scale surrounding the applied hour-markers. It makes a bigger jump between the 15th and the 16th of each month so as never to obscure the view of the tourbillon and its bridge featuring even slimmer, purer lines.
Movement – Mechanical automatic, Jaeger-LeCoultre Calibre 978, crafted, assembled and decorated by hand. 28,800 vibrations per hour. 48-hour power reserve. 302 parts. 33 jewels. 7.05 mm thick. 22-carat monobloc openworked and relief-engraved oscillating weight.
Functions – Hours, minutes and seconds, date. 24-hour 2nd time-zone display (fast adjustment in both directions). Tourbillon.
Case – 43 mm in diameter, available in 18-carat pink gold and in a 200-piece 950 platinum limited edition. Cambered sapphire crystal revealing the movement, hardness N°9.
Dials – Eggshell white for the pink gold version. Grey for the platinum version.
Hands – Gold-toned for the pink gold version. Rhodium-plated for the platinum version.
Water-resistant – 5 bar.
Straps – Black alligator leather with 18-carat pink gold buckle. Blue alligator leather with 950 platinum buckle.