Model Name: Rolex Cosmograph Daytona Reference Number: 126503-0003 Collection: Oyster Perpetual Cosmograph Daytona Case Material: Oystersteel and 18ct Yellow Gold (Rolesor) Diameter: 40 mm Bezel: Fixed bezel in yellow gold with engraved tachymetric scale Crystal: Scratch-resistant sapphire Water Resistance: 100 meters / 330 feet Case Back: Solid, screw-down Dial Color: Black Sub-dials: Three chronograph sub-dials (30-minute, 12-hour counters, and running seconds) Markers: Luminous hour markers in gold Hands: Luminous, yellow gold-tone Movement Caliber: Rolex Calibre 4131 (Self-winding mechanical chronograph movement) Power Reserve: Approximately 72 hours Chronometer: Superlative Chronometer (COSC + Rolex certification after casing) Functions: Central hour, minute, and seconds; chronograph with central second hand, 30-minute counter at 3 o’clock, 12-hour counter at 9 o’clock; small seconds at 6 o’clock Bracelet Type: Oyster Bracelet Material: Oystersteel and 18ct Yellow Gold Clasp: Oysterlock folding safety clasp with Easylink 5mm comfort extension link
