COSC Certified Watches

Previous blogs discussed chronometers and mentioned that an authenticated luxury watch is a chronometer.   So, who certifies these watches and determines whether they are chronometers?  The Contrôle Officiel Suisse des Chronomètres (COSC).

The COSC

Five Swiss areas created the COSC in 1973:  Geneva, Bern, Vaud, Neuchâtel, and, Solothurn, together with the Federation of the Swiss Watch Industry (FHS).   It is, however, a non-profit, independent organization that freely self-regulates watch designers and watch production.

The COSC rigorously tests each watch over a two week period in five separate positions, at three temperatures.  Inspectors repeatedly adjust and remove movements from the watch and tests each at various different temperatures, in various positions, over certain time periods.  Inspectors employ cameras to observe watch functions and take careful measurements to painstakingly compile data, all of which measures the watches average daily rate of accuracy.

Inspectors measure:

•    Rate resumption
•    Rate variation
•    Average daily rate
•    Mean variation rate
•    Difference between vertical and horizontal positions
•    Temperature rate variation

For certification, the COSC requires the average standard to be between -4 seconds to +6 seconds off.

What Watches does the COSC Test?

The COSC only tests watches that Switzerland manufacturers produce.  Before anyone, however, criticizes that criterion, just consider just the top brands of that list:

Patek Philippe
Blancpain
Breguet
Richard Mille
Cartier
Rolex
Jaeger-LeCoultre
Zenith
Omega
Girard Perregaux
Chopard
Officine Panerai
Audemars Piguet
Ulysse Nardin
Tag Heuer
Fortis
Carl F. Bucherer
Hamilton
Mount Blanc
Eberhard & Co.
Mido
Eterna
Roger Dubuis
Bell & Ross
Zodiac
Doxa
F.P. Journe
Baume & Mercier
Longines
Oris
Laurent Ferrier
Corum
H. Moser & Cie
Maurice Lacroix
Frederique Constant
Van Cleef & Arpels
Piaget
Franck Muller
Parmigiani Fleurier
Breitling
IWC
Tudor
Hublot
Vacheron Constantin
MB&F (Maximilian Büsser & Friends)

Dukwin

Dukwin is passionate about luxury watches.  Its founders themselves own timepieces just like the ones mentioned above.  When they sought for ways to care for them, they fell in love with watch winders and such led them to create their own brand –  Dukwin.

Dukwin watch winders are amazing problem solving devices.  Dukwin offers an exclusive collection, which the founders wish to offer to other enthusiastic watch fanciers.

Dukwin offers automatic watch winders, handmade watch winders, watch winders with fingerprint lock, and other types of watch winders for up to twelve watches.  Be sure to check out its 12 slots watch winders – such offer the best quality and a beautiful display.

Watch winders are available in multiple languages, including French and German.

Contact Dukwin today.

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