Ref. 6202 was released and first presented at the Basel Fair in 1953. The Turn-O-Graph was the first series produced Rolex to feature a rotating bezel. Rolex often promoted this first series tool watch as a convenient and simple way of calculating the "timing of a transatlantic telephone call, the rate of a machine, a patient's pulse or the speed of a train." In the late 1950s, the Turn-O-Graph was popularly marketed as "Thunderbirds" because the U.S. Air Force equipped their Thunderbird aerobatic squadron pilots with Ref. 6202 for navigational calculations.
For more information on this reference, see Martin Skeet & Nick Urul, Vintage Rolex Sports Models, 2001, p. 100–101; for an illustration of a similar model, see p. 104.
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