Model Number: 126508-0003 Collection: Cosmograph Daytona Case Material: 18k Yellow Gold Case Diameter: 40mm Bezel: Fixed 18k Yellow Gold bezel with engraved tachymeter scale Dial: Black lacquer dial with factory-set diamond hour markers Hour Markers: 8 brilliant-cut diamonds and 3 gold markers at 3, 6, and 9 o'clock Sub-dials: Champagne gold-tone chronograph counters (small seconds, 30-minute, and 12-hour) Crystal: Scratch-resistant sapphire Movement: Rolex Caliber 4131 – automatic chronograph movement Power Reserve: Approximately 72 hours Bracelet: Oyster bracelet in solid 18k yellow gold with polished center links Clasp: Oysterlock safety clasp with Easylink 5mm extension Water Resistance: 100 meters / 330 feet Functions: Hours, minutes, small seconds, chronograph, tachymeter Special Features: Superlative Chronometer certified (COSC + Rolex certification after casing) Parachrom hairspring for resistance to shocks and temperature variations Anti-magnetic and highly reliable chronograph performance