HISTORY OF CHRONOMETERS PT. 4: IN-HOUSE AND BEYOND COSC

Worn and Wound

Rolex3255

Since 1972, the Contrôle Officiel Suisse des Chronomètres, or COSC, has been the official Swiss regulatory body for chronometers, providing testing and certifications to much of the Swiss watch industry. The COSC’s stringent chronometer certification is certainly a badge of honor for any watch, but many manufacturers choose to go above and beyond with their own in-house chronometer testing. Whether for anti-magnetism, water resistance, or even greater raw accuracy, these private tests represent the absolute pinnacle of mechanical accuracy and quality.

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