The Precision of a Rolex Superlative Chronometer is of your order of −2/+two seconds a day – the rate deviation tolerated by the brand for any finished observe is noticeably scaled-down than that recognized by COSC for Formal certification of the movement on your own. The Superlative Chronometer position is https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/