Patek Philippe Perpetual Calendar Moonphase Grand Complication Watch - 5159J-001

38mm 18K yellow gold case, hinged dust covered sapphire crystal back, hand-guilloched dial, self winding perpetual calendar caliber 315 S QR movement with day, retrograde date, month, moon phase, leap year indications, and sweep second hand, approximately 48 hour of power reserve, leather strap with fold-over buckle. Water resistant to 30 meters.