The Contrôle officiel suisse des Chronomètres (COSC), the Official Swiss Chronometer Testing Institute, is the institute responsible for certifying the accuracy and precision of Swiss watches. == Background == Founded in its current form in 1973, the COSC is a Swiss non-profit organization that tests chronometers that are Swiss Made.
The Contrôle officiel suisse des Chronomètres (COSC), the Official Swiss Chronometer Testing Institute, is the institute responsible for certifying the accuracy and precision of Swiss watches. == Background == Founded in its current form in 1973, the COSC is a Swiss non-profit organization that tests chronometers that are Swiss Made.
Source: Wikipedia "COSC" · CC BY-SA 4.0
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