Chronograph Heritage The Cosmograph Daytona is a symbol of Rolexs enduring connection to the world of motor racing. With its chronograph functionality and tachymetric scale, it allows drivers to measure average speeds with precision and style. Racing Precision This reference 116523, from 2013, features a 40mm case in a combination of Oystersteel and yellow gold. The white dial is framed by a fixed bezel engraved with a tachymetric scale and powered by the calibre 4130 automatic movement, offering a power reserve of approximately 72 hours. The Oyster bracelet includes an Easylink extension and Oysterlock clasp for added comfort and security.