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The “Cosmograph” (model 6239) was unveiled in 1960. In the case of a chronograph the tachymeter is engraved on the the dial, although the Cosmograph is a chronograph by definition, unlike the chronograph, the tachymeter scale was engraved on the bezel by Rolex. Intiailly the Cosmograph was powered by a Valjoux 72B movement, rather than a Rolex movement. However the 7221/1 replaced it.
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