Rolex Cosmograph Daytona, White Gold Blue Index Dial 40MM Watch 116509DESCRIPTION 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