To make a chronographas accurate as a chronometer was the stiff challenge the watchmakers set themselves in developing the first Duomètre. Their secret weapon was the Dual-Wing concept. The Manufacture chose to equip the first model in the Duomètre collection with the chronograph function. This led to the Duomètre Chronographe model, with styling and technical characteristics that immediately earned it a place in the highest echelons of artistic watchmaking.
The first movement to use this new construction principle was the Jaeger-LeCoultre Calibre 380, boasting the major asset of displaying the time with chronometer-worthy precision. In accordance with the Dual-Wing concept, the first gear train is entirely dedicated to the time function (hours, minutes, seconds), while the second gear train is exclusively devoted to the chronograph function and features a 1/6th second jumping seconds. Each of these two mechanisms is powered by its own barrel ensuring a 50-hour power reserve (50 hours for the time, 50 hours for the chronograph). There are no transfers of energy between the two. To simplify use and for aesthetic reasons, a single crown serves to wind both barrels: turning the crown clockwise winds the time, and turning it counter-clockwise winds the chronograph.
This Calibre 380 makes the first Duomètre the very first wrist chronograph watch to operate without a coupling system to handle the stop/start time measurement functions. A single push-piece ensures perfect synchronisation of all five chronograph counters. With its case featuring welded lugs, its opaline magnetite grey dial and its Calibre 380 – the first representative of the Dual-Wing lineage – the Duomètre, brilliantly reinvented the great watchmaking classic.