The Precision of a Rolex Superlative Chronometer is of your buy of −2/+2 seconds on a daily basis – the rate deviation tolerated from the brand for a finished watch is noticeably smaller than that recognized by COSC for Formal certification of your motion by yourself. The Superlative Chronometer position https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/