The Rolex Cosmograph Daytona, launched in 1963, was designed to meet the demands of professional racing drivers. Its patented chronograph movement and bezel with tachymeter scale allow drivers to accurately measure average speeds. The name and functions are linked to the high-performance world of motor sport. The 116515LN reference combines Rolex's proprietary 18k Everose gold, an exclusive fade-resistant alloy, with a virtually scratchproof black Cerachrom bezel and a high-performance Oysterflex bracelet. The Sundust dial mades this model an icon of style and performance.