The Rolex Turn-O-Graph reference 6202 was launched in 1953. Phillips catalogues it as the first series-produced wristwatch with a rotating bezel and “the first Rolex tool watch ever produced in series”. A 1953 example sold by Phillips has a 35mm stainless steel Oyster case, a rotating bezel calibrated to 60 units with a metal insert, and a glossy black dial with luminous hour markers and a gilt outer chapter ring. It is powered by the automatic calibre A260 with 19 jewels. Rare two-tone versions in 18k yellow gold and steel followed in 1954, with cream dials, Arabic and faceted baton markers and dauphine hands. Its importance lies in the bezel: a simple, mass-produced way to measure and record elapsed time, which opened Rolex‘s long run of sports watches.

A rotating bezel had appeared earlier on the Zerograph, an elusive 1937 prototype, but the 6202 brought the idea into regular production. Original advertising pitched it for everyday timing tasks such as phone calls, meetings and parking. The US Air Force aerobatic squadron, the Thunderbirds, used Turn-O-Graphs for navigational calculations, and the model was marketed as the “Thunderbird” in North America; Phillips ties that name most closely to the later 6309 and 6609. The concept led directly to the Submariner and the GMT-Master, which share its timing bezel. Successors such as the 6309, 6609 and 1625 added a date window, and the Turn-O-Graph name was eventually folded into the Datejust family, later sold as the Datejust Turn-O-Graph with references such as the 36mm 116264.

Collectors regard the 6202 as the progenitor of Rolex‘s tool and sports watches, yet it has long traded far below the Submariner and GMT-Master it inspired, and Phillips has called a steel example “a tremendous value for the savvy collector”. That gap is narrowing: a fully original 1953 steel 6202 sold at Phillips Geneva for CHF 75,000 against an estimate of CHF 12,000 to 18,000. The two-tone 6202 is described as exceptionally rare, with only about a dozen known. Many Turn-O-Graphs were first Rolex purchases handed down in families, which adds to their appeal. The 6202 is no longer produced, and the Turn-O-Graph line itself was dropped from the catalogue in 2011, so there is no current direct successor.