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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,937 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesTesting & Inspection CentersLa Chaux-De-FondsContrôle officiel suisse des chronomètres (COSC)
Contrôle officiel suisse des chronomètres (COSC) Logo
Verified· 3 sourcesTrust Score
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.

AI-generated
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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4.1/5

Contrôle officiel suisse des chronomètres (COSC)

Trust & reputation

ranQ Trust Score of Contrôle officiel suisse des chronomètres (COSC): 4.1 out of 5.0

Trust Score4.1/ 5.0

High

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Data basis 58% · As of October 2026

Without public customer reviews the score stays capped.

Contrôle officiel suisse des chronomètres (COSC) has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
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CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Contrôle officiel suisse des chronomètres (COSC) scores 79.8 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
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CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.55.07%
Contrôle officiel suisse des chronomètres (COSC) scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
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CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).85.022%
Contrôle officiel suisse des chronomètres (COSC) scores 60.0 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.100.04%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.20.04%
Qualifications+0.00

Contrôle officiel suisse des chronomètres (COSC) reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 58%, so the score is backed by part of the criteria. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

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
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.73.06%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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