The last references with hand-wound movements were the 62, which were produced from 1971 to 1988. There followed the reference 6264, in production from 1970 to 1972, which featured the same movement but had a bezel with an acrylic inlay and screw-in push buttons. The movement was also modified, with Rolex raising the frequency of its Valjoux calibre from 18,000 to 21,600vph (vibrations per minute).
Then, for one year only, in 1970, Rolex produced the reference 6262, which saw the watch return to an engraved steel bezel and unthreaded push buttons. It also featured a black bezel with acrylic inlay. When Rolex released the reference 6240 ‘Oyster’ Cosmograph Daytona in 1965, the watch now had screw-in push buttons that sealed the watch’s case almost as hermetically as its Oyster models without the stopwatch function, making it waterproof. Nicknamed the ‘Daytona’, after the famous Florida International Speedway racetrack for which Rolex was the official timekeeper, it featured a multifaceted face with three chronograph counters – reminiscent of the cockpit of a race car – and a large tachymeter scale on the bezel in a contrasting colour (black or silver) that allowed drivers to accurately time their laps. The intention was to complete Rolex’s collection of professional timepieces, which already included the Submariner and the Explorer. Building on 30 years of close association with the world of motor sport – land speed record holder Sir Malcolm Campbell was considered the first ambassador of the brand – Rolex introduced the Cosmograph (meaning ‘measurement of the universe’ in Greek) reference 6239 in 1963. The ultimate chronograph from Rolex, the Cosmograph Daytona was designed for those with a passion for speed and, specifically, to meet the demands of professional racing drivers.
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