Laboratory

The COSC

The measurement of time

The COSC is the universally recognized and independent label awarding the official title of chronometer to Swiss movements and watches.

In measuring, testing, and certifying precision, we work relentlessly to validate the excellence of the most presitigious watch brands.

COSC video
Laboratory

Founded in 1973, the COSC was created from the shared vision of Swiss Made brands and public authorities to standardize precision measurement, ensuring the protection and continuity of Swiss watchmaking worldwide.

The origins of the COSC

  • Employees across 3 laboratories
    164
  • Number of handlings per tested movement
    65
  • Assessment criteria for certification
    7
  • Days of testing per year
    350
COSC laboratory coat

A non-profit public interest association, the COSC embodies a collective ambition dedicated to Swiss watchmaking excellence.

At the heart of our organization

People watching screen with accuracy elements

Precision Laboratories

State-of-the-art laboratories, custom-designed equipment, cutting-edge technologies... Measuring time is a continuous commitment

As Time goes by