Patek Philippe 37.2mm Grand Complications Perpetual Calendar Moon Phase Watch Gray Dial 5140P

37.2mm platinum case, interchangeable full back and sapphire crystal case back, charcoal gray sunburst dial with gold applied hour markers, caliber 240 Q 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.