Oyster structure: integral middle case, screw-down case back and winding crown. Dial diameter: 40 mm. Bezel: Bidirectional rotatable 60-minute graduated bezel with matt black Cerachrom ceramic insert, polished raised numerals and graduations. Winding crown: screw-in triple interlocking triple waterproof system. Crystal: Scratch resistant sapphire, Cyclops lens on date. Water Resistance: Water resistant up to 100 meters/330 feet. Movement: permanent, mechanical, self-winding. Functions: central hours, minutes and seconds. Clasp: Folding Oysterlock clasp with Rolex Glidelock extension system.