Patek Philippe – Grand Complications Perpetual Calendar Moonphase

38mm 18K white gold case, interchangeable full back and sapphire crystal back,hobnail-patterned bezel, black lacquered dial with gold applied hour markers, ultra-thin self-winding Caliber 240 Q movement with perpetual calendar, interchangeable full back and sapphire-crystal case back, day, date, month, leap year by hands, moon phases and 24-hour indicators, approximately 38-48 hours of power reserve, hand-stitched shiny black alligator strap with with square scales, fold-over buckle. Water resistant to 30 meters.