Rolex Cosmograph Daytona ref. 6240 is the short-lived experimental Oyster Daytona that paired a black acrylic tachymeter bezel with early screw-down chronograph pushers. Produced in steel around 1965–1969, it bridges the 6239/6241 pump-pusher era and the later screw-down-pusher Oyster Daytonas.
Open in The Dial Atlas