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DirectoryBusiness & Technical ServicesTesting & Inspection CentersLa Chaux-De-FondsContrôle officiel suisse des chronomètres (COSC)
Contrôle officiel suisse des chronomètres (COSC) Logo
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Contrôle officiel suisse des chronomètres (COSC)

Summary

About the company

The core activity of the company COSC (Contrôle Officiel Suisse des Chronomètres) is the certification of watches and the verification of their precision. The company tests and certifies watches to guarantee their accuracy and reliability, and awards the label "Swiss Excellence Certified" to watches that meet the stringent requirements.

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Offering

Products & services

Industry:Testing & Inspection Centers
✓ Offered5
Chronometer certification
Certification of movements and watches according to ISO 3159, with precision, positional and temperature tests over 12 to 20 days.
Certification of exceptional watches
Certification of finished watches according to the COSC protocol, with wear simulation, resistance to magnetism and control of the power reserve.
Horological precision tests
Laboratory testing of movements and watches, with automatic and manual measurements, performance monitoring and calculation of compliance with certification criteria.
Horology test laboratories
Three laboratories in French-speaking Switzerland equipped to test more than two million movements and watches per year, close to watch manufacturers.
Laboratory accreditation and SAS certification
Accredited service as calibration laboratory, test laboratory and product certification body with the Swiss Accreditation Service.
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Press

Media

February 19, 2026Media
Horlogerie: Le COSC prépare une nouvelle certification
tdg.ch

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Location

Avenue Léopold-Robert 65
2301 La Chaux-De-Fonds

At a glance

Legal form
Association
UID
CHE-105.908.120
Founded
2009 · 17 years
Last commercial register change
December 1, 2025
Employees
1 to 10

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