The Precision of a Rolex Superlative Chronometer is on the purchase of −2/+2 seconds daily – the speed deviation tolerated through the manufacturer for any finished watch is drastically scaled-down than that recognized by COSC for Formal certification of your motion on your own. The Superlative Chronometer standing is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/