The refe🔯rence 6265 and 6263 exemplifies the evolution of the Rolex Daytona. Introduced in 1969, the reference 6265 retained the classic metal tachymeter bezel originally seen on the references 6239, and was enhanced with a waterproof ‘Oyster’ case, screw-down waterproof pushers and crown as opposed to the earlier pump chronograph pushers also found on the reference 6239 & 6241. In addition, inside the 6265 is fitted with the famous caliber Valjoux 727, which was an evolution from the caliber 722-1 present on some 6239, 6241 and 6240. To further enhance its performance, Rolex replaced the balance to increase the precision by increasing vibrations from 18,000 to 21,000. This movement with “Superlative Chronometer Officially Certified” demarcation on the dial to celebrate the advancement brought by the improved 72ꦜ7 Caliber was eventually replaced by the automatic ‘Zenith’ chronograph caliber 4030 in 1988. The present example from 1979 has been preserved in wonderful condition.