Patek Philippe Complications Flyback Chronograph Annual Calendar 5905R-010 self-winding mechanical watch features a 42mm 18k rose gold case surrounding a sunburst blue dial on a shiny dark blue alligator strap with an 18k rose gold tang 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.