f all the quality assurance certifications for timepieces, the COSC (Contrôle Officiel Suisse des Chronomètres) certification, which attests to a watch’s chronometric performance, is probably the most widely known, often cited by the biggest names in watchmaking including the likes of Rolex, Omega and Breitling. Even so, only about six per cent of all Swiss watches are COSC-certified, thanks to the institute’s
COSC CERTIFICATION
Apr 23, 2021
2 minutes
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