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When you buy a Rolex, you may also find a small green card in addition to accessories such as manuals and warranty cards. Do you know what this small green card represents?

This concerns the issue of watch accuracy certification, which is mainly based on the current Switzerland watch certification. There are three common certifications: the first is C.O.S.C. Switzerland Chronometer certification, the second is Master Chronometer certification, and the third is Superlative Chronometer certification.

C.O.S.C. certification by the Switzerland Chronometer Observatory is carried out by the Official Chronometer Testing Institute of Switzerland (C.O.S.C.). This certification only applies to watches made in Switzerland, which are often referred to as Chronometers.

Owning this chronometer-certified watch means that when your watch leaves the factory, its daily error will be kept within the range of -4 to +6 seconds. Master Chronometer certification is carried out by the Switzerland Observatory and then sent for further certification, which is a more advanced certification than the Switzerland Observatory certification. The accuracy required for Master Chronometer certification is between 0 and +5 seconds per day, which is about 5 seconds more accurate than the Switzerland Chronometer certification in terms of accuracy.

Superlative Chronometer certification is unique to Rolex. Like the Master Chronometer, it is also certified by the C.O.S.C. But after certification, it is re-installed in the case, adjusted and tested again.