The keen observers know for a while that Rolex introduced new criteria in terms of reliability and performances. The proof is that a green seal is now attached to the majority of the new models, and from now to all of them. Rolex developed its own test protocol that concerns the whole watch, and not only the movement as it was the case until now with the single COSC certification. Speaking about precision for instance, all the watches are certified with a precision that can vary between -2 and 2 seconds ma
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