Performance Legacy The Oyster Perpetual Cosmograph Daytona is a chronograph built for speed and endurance. With its origins in the high-octane world of motor racing, it has become synonymous with precision and timeless design. Refined Engineering This model, from 2017, features a 40mm case and is powered by the calibre 4130 automatic movement with an approximate 72-hour power reserve. It is paired with an Oyster bracelet featuring Easylink and Oysterlock clasp, offering both comfort and durability.