Reference: 116680. MODEL CASE: Oyster, 44 mm, Oystersteel. OYSTER ARCHITECTURE: Monobloc middle case, screw-down case back and winding crown. DIAMETER: 44 mm. MATERIAL: Oystersteel. BEZEL: Bidirectional rotatable Ring Command bezel. Blue Cerachrom insert in ceramic, engraved numerals and inscription. WINDING CROWN: Screw-down, Triplock triple waterproofness system. CRYSTAL: Scratch-resistant sapphire. WATER-RESISTANCE: Waterproof to 100 metres / 330 feet. MOVEMENT: Perpetual, mechanical, self-winding, regatta chronograph. CALIBRE: 4161, Manufacture Rolex. PRECISION: -2/+2 sec/day, after casing. FUNCTIONS: Centre hour and minute hands, small seconds hand at 6 o’clock. Programmable countdown with mechanical memory and on-the-fly synchronization. Stop-seconds for precise time setting. OSCILLATOR: Paramagnetic blue Parachrom hairspring. WINDING: Bidirectional self-winding via Perpetual rotor. POWER RESERVE: Approximately 72 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.