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Contrôle Officiel Suisse des Chronomètres (COSC) on Instagram: "To mark the 50th anniversary of the "Chronometer Certified" standard, the COSC introduces "Excellence Chronometer Certified", a new certification designed as an extension of the existing standard. This certification strengthens requirements through: - tests conducted on the finished watch, under conditions close to real-life wear - a reduced rate tolerance of 6 seconds per day (compared with 10 seconds under the ISO standard) - magn
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