Rolex

18k, nickel lever movement (cal.727), 17 jewels, free-sprung mono-metallic compensation balance, adjusted to 3 positions, matte black dial, applied baton numerals, three gilt engine turned subsidiary dials for constant seconds, 30-minute and 12-hour registers, Oyster case with screw-down crown, pushers and case back, black bezel calibrated for tachometer, case back with inscription, case, dial and movement signed, with an 18k Rolex buckle, with a period green Rolex presentation case and Daytona leaflet 

Represented by several different reference numbers, the Rolex Cosmograph has become one of the most iconic sporting watches of all time. Replacing the 6262 model in 1971, the 6263 was given its own distinctive look with the addition of a black acrylic insert to its bezel and a new set of pushers which were now screw-down and therefore waterproof.