MODEL CASE: Oyster, 40 mm, steel OYSTER ARCHITECTURE Monobloc middle case, screw-down case back and winding crown DIAMETER:40 mm MATERIAL:904L steel BEZEL:Unidirectional rotatable 60-minute graduated, scratch-resistant Cerachrom insert in ceramic, numerals and graduations coated in platinum WINDING CROWN:Screw-down, Triplock triple waterproofness system CRYSTAL:Scratch-resistant sapphire, Cyclops lens over the date WATER-RESISTANCE:Waterproof to 300 metres / 1,000 feet MOVEMENT:Perpetual, mechanical, self-winding CALIBRE 3135, Manufacture Rolex FUNCTIONS:Centre hour, minute and seconds hands. Instantaneous date with rapid setting. Stop-seconds for precise time setting PRECISION Officially certified Swiss chronometer (COSC) OSCILLATOR Paramagnetic blue Parachrom hairspring WINDING Bidirectional self-winding via Perpetual rotor BRACELET:Oyster, flat three-piece links BRACELET MATERIAL:904L steel CLASP:Folding Oysterlock safety clasp with Rolex Glidelock extension system DIAL:Green DETAILS:Highly legible Chromalight display with long-lasting blue luminescence