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Glossary of watchmaking

Official rating certificate

Bulletin officiel de marche | 公式歩度証明書/コウシキホドショウメイショ | 官方评级证书

A document, issued by an Observatory or an official ratings bureau, that certifies the quality of a watch which has proven, in trials, to meet with a given standard. Only a watch that has received an official rating certificate can be called a chronometer.