Understanding the complex world of chronometers
Understanding COSC Validation and Its Importance in Horology COSC Certification and its Strict Standards Controle Officiel Suisse des Chronometres, or the Controle Officiel Suisse des Chronometres, is the authorized Swiss testing agency that attests to the precision and precision of wristwatches. COSC certification is a sign of excellent craftsmanship and dependability in timekeeping. Not all timepiece brands follow COSC…