Patek Philippe Annual Calendar Chronograph 5960P-001

Patek Philippe Annual Calendar Chronograph Ref. 5960P-001 encased in a 40.5mm 950 platinum case, it features a distinctive sunburst anthracite (grey) dial characterized by three arched apertures at the top for the day, date, and month. The bottom of the dial is dominated by a large "monocounter" that ingeniously combines both 60-minute and 12-hour chronograph totalizers into a single sub-dial. This sub-dial also integrates a day/night indicator, while a small power reserve display sits just below the date window at 12 o'clock. Powering this complication is the self-winding Calibre CH 28-520 IRM QA 24H, which utilizes a vertical disc clutch and a flyback mechanism.