Patek Philippe annual-calendar, self-winding wristwatch is the first of its kind. Conceived, built and patented by Patek Philippe, the calendar mechanism runs on an annual cycle from March 1 to the end of February of the following year, adjusting automatically for months of 30 and 31 days.
Cal. 315S QA automatic movement with day, date, month and sweep seconds and 24-hour indicator consists of a complex gearing of wheels and pinions, bringing the total number of parts to 316.
Dial with luminous hands and Roman numerals in gold. Case in 18-carat rose gold or platinum.
Sapphire-crystal glass and caseback.
Water-resistant to 25 meters.