COSC: Official Swiss Chronometer Testing Authority | COSC (original) (raw)
Since 1973, the COSC has subjected every timepiece to uncompromising testing to certify its utmost precision.
COSC, SWISS EXCELLENCE CERTIFIED
- 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
Behind the scenes of certification
How the COSC certifies precision in chronometry
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