The Rolex Cosmograph Daytona reference 126503 is an iconic chronograph blending Oystersteel and 18k yellow gold, known as Yellow Rolesor. Introduced in 2023, it features a 40mm case and an Oyster bracelet. Powered by the self-winding Calibre 4131, it offers exceptional precision and approximately 72 hours of power reserve. Designed for endurance racing drivers, it boasts an engraved tachymetric scale on the bezel and is waterproof to 100 meters.