Institutions › Certification bodies

THE BESANÇON CHRONOMETRIC OBSERVATORY

Origin and history

Founded in 1855, the Besançon Chronometric Observatory was originally part of the Besançon astronomical observatory, located in the Jura region, the cradle of French horology. Its initial mission was to provide extremely precise time measurement for scientific and navigational needs. As early as 1878, the Observatory began testing and certifying chronometers.
In the 21st century, the Observatory continues to maintain its reputation as a leading authority in chronometry. It has adapted to technological advances and remains a key player in certifying the performance of high-precision mechanical watches.
Besançon Hallmark - Viper

Official hallmark of the Besançon Observatory.

Certification criteria

The certification from the Besançon Chronometric Observatory is a mark of distinction affirming the quality and precision of a watch. To obtain this certification, watches must meet the following criteria:

Chronometric standard

  • The timepiece must reach the precision levels defined by the international ISO 3159 standard, relating to chronometers.
  • The watch’s Movement is tested for a daily deviation of -4/+6 seconds per Day.

Testing process

  1. The movements undergo a 15-Day test.
  2. Precision is tested in five different positions (Dial up, Dial down, Crown left, Crown up, and Crown down).
  3. The watch’s performance is evaluated under different temperatures (8°C, 23°C and 38°C).
  4. The tests are carried out on fully assembled watches in their cases, simulating real-world conditions of use.

Certification mark

  • Watches that pass the tests are engraved with the emblem of the Besançon Observatory and receive a certificate detailing their performance.

Transparency

  • The certification process is conducted independently, ensuring impartiality and compliance with the highest standards of precision.

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