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Watch Guides
What "chronometer" on a dial actually means — and what it doesn't.

The Contrôle Officiel Suisse des Chronomètres tests bare movements (not finished watches) for 15 days, in five positions, at three temperatures.
About 6% of Swiss mechanical output is COSC certified — mostly Rolex, Omega, Breitling and Tudor. METAS Master Chronometer (Omega) and Patek Seal go further still, testing the cased watch and adding magnetism resistance.