COSC Certified Watches: What is COSC Certification?

Your Guide to COSC-certified Watches

Is the watch you are thinking of buying COSC-certified? Not all watches qualify though. Only the highest quality watches can pass the exacting tests required to receive this distinction. Purchasing a certified watch is your assurance that your new watch is of exceptionally high quality.

Controle Officiel Suisse des Chronometres (COSC)

What is COSC Certification?

The Controle Officiel Suisse des Chronometres (COSC) is a neutral and impartial Swiss non-profit organization. They work independently of watchmakers. Their goal is to certify the finest quality Swiss watches through rigorous testing of a watch’s internal timekeeping components. Not any watch can just pass the test and receive an official certificate. A watch must have only the finest components possible. And of course, it’s assembled by expert watchmakers only.

certification from the Controle Officiel Suisse des Chronometres (COSC)

If a timepiece gains distinction as a certified watch, it will have a unique identification number engraved on the movement and receive an official certificate. COSC-certified watches are clearly distinct from ordinary watches and have a must higher added value. More than a million watches a year receive a certification. But that is still only a small fraction (6%) of Swiss watchmaking already justifiably renowned!

COSC Certified Watch Brands

In 2015, there were three watch brands with the most timepieces to receive certifications. Rolex topped the list in 2015 with 795,716 watches receiving their certificates. Getting second place was Omega with 511,861 certified watches. Breitling watches received 147,917 certificates. Of those, 28,499 were quartz models.

side view of Rolex Sky Dweller black dial watch

Of all the other watch brands tested, none received more than 100,000 certificates, although Tissot came close. They had 96,563 certified timepieces including 30,581 quartz models. Tissot was the overall leader in quartz timepieces. Back in 2008, Longines introduced its Record Collection. That collection was entirely full of COSC-certified watches.

Are You Ready for a Certified Watch?

A COSC-certified watch is right for you if quality, craftsmanship, and precision are important to you. At, we carry a great selection of watches that were deemed worthy of the certification. You can be rest assured that any watch you purchase with us is guaranteed to be authentic and in perfect working order. Contact us for more information or to place an order.

*Citing confidentiality concerns, watchmakers requested that COSC no longer publish exact numbers and the organization agreed. 

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