COSC

Also known as “C.O.S.C.”. Abbreviation for “Contrôle officiel suisse des chronomètres”, French for “Swiss chronometer testing bureau.” COSC is a Swiss-government-sponsored agency that tests watches submitted to it and issues chronometer certificates to those that are precise enough to meet COSC standards. COSC operates three testing facilities: in Bienne, Le Locle and Geneva.

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