388

The in-house hand-wound Jaeger-LeCoultre Calibre 388 utilizes the patented Duometre system, featuring two independent gear trains joined by a single escapement for optimal accuracy. It includes a 163-part Heliotourbillon triple-axis tourbillon under 0.7 grams, a perpetual calendar with grande date, moon phase, day/night indicator, leap year display, and dual power reserve indicators. Comprising 655 parts and 89 jewels, the 34.3 mm by 11.15 mm movement beats at 28,800 vibrations per hour (4 Hz) with a 46-hour power reserve.