Swiss Excellence Certified

The universally recognized
and independent label certifying
Swiss watchmaking excellence.

Since 1973, the COSC has subjected every timepiece to uncompromising testing to certify its utmost precision.

COSC, SWISS EXCELLENCE CERTIFIED

Over 60 brands are certified by the COSC.

Founded at the initiative of Swiss watch brands, the COSC dedicates its expertise and independence to certifying watches destined to join the watchmaking legend.

Certification stage, Visual check of engraving number

Federations, schools, associations, trade shows or training programs... The COSC works hand in hand with all the key players in the Swiss watchmaking industry, united in their commitment to showcasing this unique expertise worldwide.

The COSC, a trusted partner of Swiss watchmaking excellence

Number of certified movements in 2025
2,1 million
Number of movements certified since the COSC's creation in 1973
57 million
Percentage of mechanical watches exported in 2025 that are COSC-certified
39%
Number of testing days
12 to 20

Person with turned back watching outside

From heritage to innovation

For over 50 years, our equipment and processes have continuously evolved to keep pace with the latest innovations in Swiss chronometry. As watchmakers push the boundaries by creating ever more innovative timekeepers, the COSC is doing the same for time measurement.