The Precision of a Rolex Superlative Chronometer is of your order of −two/+two seconds a day – the rate deviation tolerated from the brand name for just a completed observe is considerably more compact than that acknowledged by COSC for official certification of the movement by yourself. The Superlative Chronometer https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
Brands That manufacture chronometer watches - An Overview
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