COSC

ChronometerChronometer Certificatechronometer certificationContrôle Officiel Suisse des ChronomètresCOSC (Official Swiss Chronometer Testing Institute)Precision testing
COSC is Contrôle Officiel Suisse des Chronomètres, the Official Swiss Chronometer Testing Institute, which is the institute responsible for certifying the accuracy and precision of wristwatches in Switzerland.wikipedia
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