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A Chronometer is a certified, high-precision timepiece that meets the stringent standards of the C.O.S.C. (Contrôle Officiel Suisse des Chronomètres / Swiss Office for Chronometric Controls). Each movement is tested for 15 days, in 5 positions and at 3 temperatures while operating under very demanding conditions. To earn the title of Chronometer, a mechanical movement, either automatic or manual, must meet the 7 criteria defined by ISO 3159 standard and applied by the C.O.S.C. Whatever the external conditions, it must maintain an accuracy of between -4/+6 seconds per day.