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).


See more about COSC

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

  • Each movement is individually 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 chronometer is a high-precision movement certified by the COSC, capable of displaying the seconds, tested over a period of 15 consecutive days and nights, in 5 positions and at 3 temperatures by the COSC. Each chronometer is issued with an individual certificate by the COSC which states the serial number of the movement. Mechanical movements must satisfy seven extremely stringent criteria to earn the distinction.

Chopard LUC Chrono one
L.U.C Chrono One 18-carat white gold Discover

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

Chopard LUC XP Tonneau
L.U.C XP Tonneau 18-carat rose gold Discover

Chopard COSC certification


AN EXCLUSIVE CERTIFICATION

 

Less than 30% 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