The Cosmograph Daytona was introduced in 1963. It was projected to meet the rigorous demands of professional race drivers. The success of the Rolex Daytona is largely due to Sir Malcolm Campbell, a legendary personality in the motor sport world, who was also known as the Speed King, and was also the first Rolex Ambassador. In his Blue Bird race cars, Sir Malcolm Campbell set several land-speed records both in Europe and at a racetrack in a little-known Florida city called Daytona Beach wearing a Rolex Daytona on his wrist. The Cosmograph Daytona 116503 is presented with a 40 mm stainless steel and yellow gold case. Its champagne diamond dial features a central sweep seconds hand allows an accurate reading of 1/8 second, while the two counters on the dial display the elapsed time in hours and minutes. The combination of its dial features and it fixed tachymetric scale, also in 18k yellow gold, allows drivers to measure their average speed (up to 400 kilometers per hour) and to accurately map their track times and tactics with extraordinary precision. In addition, the Daytona 116503 Chronograph is water resistant down to 100 meters. The Daytona 116503 is equipped with Rolex calibre 4130 self-winding movement, with a power reserve of approximately 72 hours. The Daytona 116503 stainless steel and yellow gold oyster bracelet features flat three-piece links made from a combination of 904L steel and 18K yellow gold, folding Oysterlock buckle with Easylink 5mm comfort extension link. It resembles the elegance delivered by Rolex tradition combining comfort and durability. All these characteristic make the Daytona 116503 an icon eternally joined in name and function to the high‑performance world of motor sport.