Patek Philippe Complications Flyback Chronograph Annual Calendar 5905/1A-001 self-winding mechanical watch features a 42mm stainless steel case surrounding an olive green sunburst dial on a stainless steel bracelet with a folding buckle. Functions include hours, minutes, flyback chronograph with central chronograph seconds hand and 60-minute counter; annual calendar with day, date, month, day/night indicator. This watch is powered by the mechanical movement Caliber CH 28‑520 QA 24H. This watch is water-resistant to 30m.