Racing Heritage Introduced in 1963, the Rolex Cosmograph Daytona was designed for professional racing drivers. Its tachymetric scale, chronograph functions and high-performance movement have made it a legend on and off the track, embodying precision and endurance. Sporting Sophistication This 2010 reference 116523 features a 40mm case in Oystersteel and yellow gold, with a white dial accented by black counters and Arabic numerals. Powered by the calibre 4130 automatic movement, it delivers a 55-hour power reserve. The Oyster bracelet includes Easylink and an oysterlock clasp for secure and adaptable wear.