Audemars Piguet Royal Oak Perpetual Calendar (26574STOO1220ST01) self – winding automatic watch, features a 41mm stainless steel case surrounding a silver grande tapiserrie dial on a stainless steel bracelet with folding buckle. Functions include hours, minutes, seconds, date, day, month, moon phase and perpetual calendar. This watch comes complete with the original box and papers. I Serial. We back this watch with a 2-Year WatchBox warranty!