SIGNED ROLEX, OYSTER COSMOGRAPH, DAYTONA MODEL, REF. 6263, CASE NO. 9’323’699, CIRCA 1986

Introduced around 1970 and in production until 1987, reference 6263 and 6265 represented Rolex's continued development of a waterproof Daytona following on from the earlier reference 6240. As a combination of calibre 727 higher frequency movement, the larger crown, screw down pushers and the black acrylic bezel, for many collectors reference 6263 represent the ultimate configuration of the Daytona.
Produced in steel, 14k and 18k gold, it was only the precious metal cased version that proudly stated the fact that the movement has been tested by the Contrôle Officiel Suisse des Chronomètres. It is an unusual feature for a chronograph of the period. Consequently, dials fitted on such examples bear the designation “Superlative Chronometer Officially Certified” at 12 o’clock, and “Cosmograph” above the 6 o’clock register.