COSC Certification Archives - First Class Watches Blog

Why is COSC Certification Important?

You may have seen some watches that are listed with something called a ‘COSC certification’. COSC stands for 'Contrôle Officiel Suisse des Chronomètres', which is the name of the organisation…

Katie Dickinson March 10, 2023

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What is COSC?

Watchmaking is full of all kinds of complicated jargon. From types of movements to specific features, watch collectors seem to almost have their own language. Whether you're planning on entering…

Gabriela Ivanova August 19, 2022

Guides

All About COSC Certification, Is It Important?

The Contrôle Officiel Swisse des Chronomètres (or the Official Swiss Chronometer Testing Institute) is an independent not-for-profit organisation that tests Swiss-made timepieces. The organisation is very specific about the standard…

Neamh McMillan March 4, 2021