Hallmark of Geneva - History and Standards
The Geneva law of 6 November 1886 created the optional hallmark to defend the reputation of Geneva watchmaking against lower-quality imports. The certification was originally administered by the Geneva School of Horology and is now run by Timelab, the Geneva laboratory of horology and microengineering, which significantly revised the criteria in 2011 to extend testing to the complete watch (not just the movement).
The 2011 revision
Where the original 12 criteria covered only finishing and construction of the movement, the 2011 standard adds end-of-line tests on the cased watch: chronometric performance (over a seven-day cycle in different positions), water resistance, and power-reserve verification. Movements must still be assembled in the canton of Geneva.
Brands using the hallmark
Vacheron Constantin (the largest user, applying the hallmark across the Patrimony, Traditionnelle and Overseas collections), Roger Dubuis (which applies the hallmark to its entire production), and historically Patek Philippe (which left the hallmark in 2009 to create its own Patek Philippe Seal with stricter accuracy criteria of -3/+2 sec/day).
Key facts
- ▸Established by Geneva law on 6 November 1886.
- ▸Significantly revised in 2011 to add end-of-line tests on the cased watch.
- ▸Patek Philippe replaced it with its own seal in 2009.