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When, in 1951, the regulations changed and it became compulsory to obtain chronometer certification from an official body, Rolex went further and made sure its movements obtained certificates bearing the citation “particularly good results.” This distinction gave rise to the famous phrase still inscribed on Rolex watch dials today: “Superlative Chronometer Officially Certified”. Since the creation of the COSC (Swiss Official Chronometer Testing Institute) in 1973, special citations are no longer given on the certificates. But the signature on Rolex dials is a reminder that since the early 20th century, Rolex has played a central role in the development of the modern precision watch.
