Vacheron Constantin

Skeleton-wristwatch with perpetual calendar and self-winding movement showing the hours, minutes, day, date, month and moon phases. Its highly elaborate movement features a wheelwork completing a full rotation in four years. It thus remembers February 29 on leap years. It also includes four correctors for perfectly harmonizing all functions. The self-winding movement is only 4.05 mm thick. Case in 18-karat yellow gold or platinum. Moon disk in lapis lazuli. (VACHERON CONSTANTIN)