Enduring Precision The Cosmograph Daytona is Rolexs definitive chronograph, built for endurance and accuracy. Designed with motorsport in mind, it remains a symbol of high-performance watchmaking and timeless style. Racng Daytona This reference 116503 features a 40mm case in Oystersteel and yellow gold, white dial, and a fixed tachymetric bezel. Powered by the calibre 4130 automatic chronograph movement, it delivers a 72-hour power reserve. The Oyster bracelet includes an Easylink extension and Oysterlock clasp, offering a bold and refined take on the Daytona legacy.