9/22/2023 0 Comments Certina serial number systemAfter passing the test, the movement receives a certificate which validates its accuracy rating. If the movement receives the COSC certificate, the manufacturer usually labels the watch with the word “Chronometer” or the French “Chronomètre”. Before the COSC’s founding in 1973, the audit was performed by various private and semigovernmental laboratories. The Swiss movement of a watch must pass a 15-day endurance test (in accordance with NIHS 95-11 / ISO 3159) conducted by the independent Swiss observatory Contrôle officiel suisse des chronomètres (COSC), in order for it to be entitled to use the name official chronometer. In the past, these were needed for timing and navigation on vessels and aircrafts. The term “Chronometer” (from ancient Greek chrónos “time” and métron “measure, measuring stick”) indicates highly precise watches.
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