Patek Philippe’s Ref. 5978P-010 Pairs Its Hand-Wound Chronograph With an Instantaneous Perpetual Calendar for the First Time, at $337,585
At midnight, an ordinary perpetual calendar walks its displays forward, one slow click at a time. The Patek Philippe Ref. 5978P-010 jumps. Day, date, month, leap year and the day-night indicator snap into their new positions together, in under 30 milliseconds, because
