Reference: 216570. MODEL CASE: Oyster, 42 mm, Oystersteel. OYSTER ARCHITECTURE: Monobloc middle case, screw-down case back and winding crown. DIAMETER:42 mm. MATERIAL: Oystersteel. BEZEL: Fixed, 24-hour graduated. WINDING CROWN: Screw-down, Twinlock double waterproofness system. CRYSTAL: Scratch-resistant sapphire, Cyclops lens over the date. WATER-RESISTANCE: Waterproof to 100 metres / 330 feet. MOVEMENT: Perpetual, mechanical, self-winding. CALIBRE: 3187, Manufacture Rolex. PRECISION: -2/+2 sec/day, after casing. FUNCTIONS: Centre hour, minute and seconds hands. 24-hour display. Second time zone with independent rapid-setting of the hour hand. Instantaneous date. Stop-seconds for precise time setting. OSCILLATOR: Paramagnetic blue Parachrom hairspring. High-performance Paraflex shock absorbers. WINDING: Bidirectional self-winding via Perpetual rotor. POWER RESERVE: Approximately 48 hours. BRACELET: Oyster, flat three-piece links. BRACELET MATERIAL: Oystersteel. CLASP: Folding Oysterlock safety clasp with Easylink 5 mm comfort extension link. DIAL: White. DETAILS: Highly legible Chromalight display with long-lasting blue luminescence.