CHRONOMETER CERTIFIED

EXTREME PRECISION

 

"Chronometer-certified” means that the movement of a watch is adjusted to within a tolerance of between -4 /+6 seconds per 24 hours, corresponding to 99.99 % precision. This supreme guarantee of reliability and precision is issued by the Swiss Official Chronometer Testing Institute (Contrôle Officiel Suisse des Chronomètres, COSC), an independent organisation certified by the Swiss Accreditation Service (SAS).


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COSC certification
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The L.U.C Chrono One, with a transparent case back

  • TO ENSURE A FAIR EVALUATION OF ACCURACY, MULTIPLE EXAMPLES OF THE SAME WATCH ARE TESTED BY THE COSC.
  • IN ACCORDANCE WITH THE ISO 3159 NORM, IT CONDUCTS AN EXHAUSTIVE EXAMINATION OF ALL CALIBRES THAT ARE SUBMITTED TO IT VIA A BATTERY OF TESTS LASTING 16 DAYS.
  • DURING 384 HOURS, THE PRECISION OF MECHANICAL MOVEMENTS IS MEASURED IN FIVE POSITIONS AND AT THREE DIFFERENT TEMPERATURES.
  • WHATEVER THE CONDITIONS, THE MOVEMENTS MUST MAINTAIN A PRECISION RANGING BETWEEN -4 AND +6 SECONDS PER DAY FOR CALIBRES MEASURING MORE THAN 20 MM IN DIAMETER, AND BETWEEN -5 AND +8 SECONDS FOR SMALLER CALIBRES.
  • THE LEVEL OF RELIABILITY AND QUALITY REACHED BY L.U.C CALIBRES ENABLES THEM ALL TO EARN CHRONOMETER CERTIFICATION FROM THE SWISS OFFICIAL CHRONOMETER TESTING INSTITUTE (COSC).
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THE SWISS OFFICIAL CHRONOMETER TESTING INSTITUTE (COSC) CERTIFIES THE PRECISION OF THE MOVEMENTS

Nothing can compare with the objectivity of an independent organisation when it comes to granting a quality label, and in Switzerland only the COSC is entitled to guarantee the precision of a movement by a chronometer rating certificate.

COSC certification


CHRONOMETER CERTIFICATION

SEVEN STRINGENT CRITERIA

 

A certified chronometer is a high-precision movement capable of displaying the seconds and that has been tested over a period of 15 consecutive days and nights, in five positions and at three temperatures by an official neutral body (COSC). Each chronometer is unique, identified by a number engraved on its bridges and a certification number given by the COSC. Mechanical movements must satisfy seven extremely stringent criteria to earn the much sought-after distinction.

Chopard LUC Chrono one
L.U.C Chrono One 18k white gold Shop

Chopard LUC 1937
L.U.C 1937 Classic stainless steel Shop

Chopard LUC XP Tonneau
Shop

Chopard COSC certification


ONLY FIVE PERCENT QUALIFY

A PRIVILEGED CERTIFICATION

 

Only five percent of the watchmaking production of Switzerland qualifies for this exclusive certification. The level of reliability and quality reached by L.U.C calibres enables them all to earn chronometer certification from the Swiss Official Chronometer Testing Institute (COSC).

Chopard COSC watchmaking