L1902

This hand-wound 'Grand Complication' movement features a visible chronograph-rattrapante mechanism, while the grande sonnerie and perpetual calendar remain hidden beneath. Every component is meticulously hand-finished, with finisseurs dedicating over a month to the black-polishing of levers, rockers, and springs. The mainspring barrel, featuring solarisation, offers a 30-hour power reserve. The grande sonnerie requires expert manual tuning by ear to ensure precise switching sequences and optimal sound quality. The watch features grand and small strikes for quarter-hour intervals, while the minute repeater, triggered by the 8 o'clock slide, provides one-minute accuracy. Three internal snails sample the time acoustically, with low tones for hours, high tones for minutes, and double tones for quarters, powered by a dedicated 24-hour spring barrel. The 248-part split-seconds chronograph utilizes two column wheels and pushers to measure multiple intermediate times. A rare flying-seconds mechanism, powered by a third spring barrel, uses a 30-tooth wheel and five-pointed star to track fractions of a second. The perpetual calendar tracks the Gregorian cycle, including leap years, and requires its first adjustment in 2100 due to the leap year omission rule; it uses a 48-segment wheel to mechanically code month lengths.