Men's Patek Philippe Perpetual Calendar Retrograde Date watch, 18k yellow gold case (38mm diameter) and a bezel made of the same precious metal. Brown alligator leather strap with deployment clasp. Patek Philippe caliber 324 S QR hand-winding movement with 45 hour approximate power reserve. Opaline dial with Hours, Minutes, Seconds, Perpetual Calendar, and Moon Phase. Sapphire crystal "see-through" case back.