Perfected to keep up with the pressures of motorsports, the Cosmograph Daytona was created to master the speed of timekeeping by featuring a chronograph, a 30-minute counter, and stop-seconds for precise time setting. It comes with a 40mm white gold case that has a screw-down case back, a scratch-resistant sapphire and features a fixed 18K white gold bezel with an inner engraved tachymetric scale. Enclosed in the case is the 4130 Caliber that has bidirectional self-winding via Perpetual rotor, a-2/+2 sec/day precision and a 72-hour power reserve. The dial is blue with index hour indicators and three sub-dials. The oyster bracelet is made of 18-carat white gold with a folding oyster lock safety clasp. It has a water resistance of 100 meters (330 feet).