52640

Calibre 52640; IWC 'Eternal' calendar. This inaugural secular perpetual calendar from IWC accounts for the Gregorian calendar's intricate leap year rules by omitting three leap years every four centuries. Furthermore, the moon phase indication offers such extreme precision that it is theoretically off by only one day every 45 million years. This IWC-manufactured self-winding movement features a 168-hour power reserve, a 28,800 VPH (4 Hz) frequency, 396 components, and 54 jewels. It includes an eternal calendar displaying the date, day, month, four-digit year, and eternal moon phase, plus a power reserve indicator.