What is a MASTER CHRONOMETER and who is METAS? Omega marks a new standard of quality, going well beyond the Contrôle Officiel Suisse des Chronomètres (COSC) certification. – Watch-Insider.com
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![What is COSC? COSC-Certification For Watches [Complete Guide] - Millenary Watches](https://millenarywatches.com/wp-content/uploads/2019/12/11515325_fullsize-e1587137347755.jpg "What is COSC? COSC-Certification For Watches [Complete Guide] - Millenary Watches")
What is COSC? COSC-Certification For Watches [Complete Guide] - Millenary Watches
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