They feature an important novelty both aesthetically and functionally, based on the experience of the previous reference (ref.6240). The new models are equipped with screw-down chronograph pushers to achieve water resistance and are used with the new 7mm TRIPLOCK winding crown.
Despite these changes, and Rolex's efforts to achieve a water-resistant chronograph, the maximum depth will be 50m/165ft.
Specifically, this model of 6263 produced in 1985 with serial number 91XXXXX, mounts a silver dial with white lettering and subdials, Daytona lettering in red located above the six o'clock counter. Second series metal bezel with black plastic insert and tachymeter scale printed in white. Oyster Triplock 702 crown, P302 fluted pushers. Watch with 37mm diameter steel case with steel strap and Valjoux 727 movement. Preserved in Excellent condition.