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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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Five Things You Should Know About the COSC | WatchTime - USA's No.1 Watch Magazine
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In Short: COSC Certification - StockX News
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Frederique Constant Highlife Automatic COSC Watch
