Cosmograph Daytona

Rolex’s racing chronographChronographA watch function for starting, stopping and resetting an elapsed-time measurement independently of the ordinary time display., introduced in 1963 as the Cosmograph with its tachymeterTachymeterA chronograph scale that converts the time taken to travel a known distance into average speed. The distance and scale units must correspond. moved from the dial to the bezelBezelThe frame surrounding the crystal at the front of a watch.. Covers the pre-Daytona Oyster chronographsChronographA watch function for starting, stopping and resetting an elapsed-time measurement independently of the ordinary time display. 6234 and 6238, the hand-woundManual windingWinding a mechanical watch’s mainspring by turning the crown. Some automatic movements also allow manual winding. Valjoux-based references to 1988 and the Zenith-based self-windingAutomaticA mechanical movement wound by a rotor as the watch moves on the wrist. 16520 family to 2000.