Understanding the complex world of chronometers
Rolex watches Understanding COSC Validation and Its Importance in Horology COSC Certification and its Stringent Criteria Controle Officiel Suisse des Chronometres, or the Controle Officiel Suisse des Chronometres, is the authorized Switzerland testing agency that certifies the precision and precision of wristwatches. COSC certification is a mark of superior craftsmanship and trustworthiness in chronometry. Not all watch brands seek…