Geneva Chronometric Observatory
The timeless quest for horological precision
The Geneva Chronometric Observatory’s mission is to measure the precision and reliability of mechanical timepieces.
Two reference certifications
Certified Chronometer
The title "certified chronometer", in accordance with ISO 3159 — the world reference for horological precision.
Learn more →OC+ Label
The OC+ label evaluates the complete watch under real-world conditions and includes additional tests: water resistance, magnetism and power reserve.
Learn more →Integrity, rigour, dialogue: the Geneva Chronometric Observatory serves the Swiss watchmaking industry by supporting brands through their certification process.
A unique scientific heritage
As the successor to the Astronomical Observatory founded in Geneva in 1772, the Chronometric Observatory is part of a rigorous scientific tradition.
As early as the 19th century, the observatories of Geneva, Neuchâtel and Besançon established the first methods of measuring time based on the observation of the stars.These institutions laid the foundations for chronometry competitions and modern testing protocols.
These institutions laid the foundations for chronometry competitions and modern testing protocols.
Today, this legacy lives on through updated methods, serving the contemporary watchmaking industry.
People at the heart of precision
Behind every certification, there is expertise.
Technicians, engineers and analysts are involved at every stage of the process: preparation, reassembly, measurement and analysis. Their experience enables them to interpret the results with rigour and consistency.
Watchmaking precision does not rely solely on instruments: it is also the result of passed-down expertise.
Why certify a watch?
Chronometric certification is not merely a technical formality. It is a commitment, concrete proof that the watch meets strict criteria of precision, consistency and reliability.
For watchmakers, it constitutes objective proof of technical mastery.
For customers, it guarantees that the watch has been assessed according to an independent and recognised protocol.
Few watches achieve this distinction: it is precisely this that gives it its strength and value among collectors and discerning enthusiasts
