The Precision of the Rolex Superlative Chronometer is of the buy of −2/+2 seconds each day – the rate deviation tolerated from the brand for the completed watch is noticeably scaled-down than that approved by COSC for Formal certification of your motion by itself. The Superlative Chronometer standing is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/