As one of the innovations in the latest additions to the Oyster Perpetual collection, Rolex introduced the entirely new 39mm case, as seen in this particular model. The Oyster case, with middle case made of a solid block of 904L stainless steel, features domed bezel and scratch-resistant sapphire-crystal. Its 100m water resistance is accomplished with the fluted screw-down case back and the Twinlock double waterproofs system for the screw-down crown. Inside, the self-winding Perpetual 3132 caliber certified by COSC features the blue Parachrom hairspring and Paraflex shock absorbers, as well as bidirectional self winding via Perpetual rotor. The harmonious dark rhodium dial with neat hour markers features hours, minutes and seconds indication by centre hands. The watch is worn on the wrist with the 904L stainless steel Oyster bracelet with flat three-piece links and the Oysterclasp.