BESANÇON OBSERVATORY CERTIFICATION
Origin and History
Established in 1855, the Observatoire Chronométrique de Besançon was initially part of the astronomical observatory of Besançon, located in the Jura region, a cradle of French watchmaking. Its purpose was to provide highly accurate time for scientific and navigation needs. By 1878, the Observatoire began testing and certifying chronometers.
In the 21st century, the Observatoire continues to uphold its reputation as a leading authority in chronometry. It has adapted to technological advancements and remains a critical player in certifying the performance of high-precision mechanical watches.
The official seal of the Besançon Observatory Certification
Criteria for Certification
Certification by the Observatoire Chronométrique de Besançon is a mark of distinction, affirming the quality and precision of a timepiece. To earn this certification, watches must meet the following criteria:
Chronometer Standard
The timepiece must achieve accuracy levels outlined in ISO 3159, the international standard for chronometers. The watch movement is tested for a daily rate deviation of -4/+6 seconds per day.
Rigorous Testing Process
- Movements undergo a 15-day test.
- Accuracy is tested in five different positions (dial up, dial down, crown left, crown up, and crown down).
- The watch’s performance is evaluated under varying temperatures (8°C, 23°C, and 38°C).
- Testing occurs while the watch is fully assembled in its case, mimicking real-world conditions.
Certification Mark
Timepieces that pass the tests are engraved with the Besançon Observatory insignia and issued a certificate detailing their performance.
Transparency
The certification process is conducted independently, ensuring impartiality and adherence to the highest standards of precision.