Patek Philippe Annual Calendar 5146J-010 self-winding automatic men’s watch, features a 39mm 18kt yellow gold case surrounding a slate gray dial on a genuine Patek Philippe alligator strap with a 18kt yellow gold buckle. The movement is Caliber 324 S IRM QA LU with functions that include an annual calendar with moonphase, day, date, month, hours, minutes, and seconds. This watch features a 45 hour power max reserve and is water resistant to 30m.