The Rolex Cosmograph Daytona reference 126503 is the modern Yellow Rolesor version of the legendary racing chronograph, introduced in 2023. It features a 40mm Oyster case combining Oystersteel and 18k yellow gold, paired with a fixed yellow gold bezel engraved with a tachymetric scale. Powered by the in-house Calibre 4131 automatic chronograph movement, it offers approximately 72 hours of power reserve and exceptional precision. Dial options include bright black, white, and golden (champagne) finishes, with some variants featuring diamond-set hour markers. The watch is fitted with a two-tone Oyster bracelet equipped with the Oysterlock safety clasp and Easylink comfort extension. Waterproof to 100 metres, the 126503 perfectly balances sporty performance with luxurious two-tone elegance.