Patek Philippe 37.2mm Perpetual Calendar Moonphase Grand Complication Watch Black Dial 5140P

37.2mm platinum case, interchangeable full and sapphire-crystal back, ebony-black sunburst dial with diamond hour markers, caliber 240 Q ultra-thin self-winding movement with perpetual calendar (day, date, month, leap year by hands, moon phases, 24-hour dial), approximately 38-48 hours of power reserve, shiny black alligator strap with square scales, fold-over buckle. Water resistant to 30 m.