The Patek Phillipe Nautilus 5980R is made of 18K Rose Gold. The inspiration for its design was the universal shape of a porthole found on virtually all maritime vessels. Featured with a brown dial and gold applied hour markers. Has a case diameter of 40.5 mm. Automatic self-winding movement Caliber CH 28-520 with a 55 hour power reserve Functions on the well-laid dial are: hours, minutes, seconds & date. The caseback is sapphire crystal. The Nautilus has a screw down crown. Strap material is a brown leather strap with a fold over clasp water resistant to 120 meters / 360 feet.