The Precision of a Rolex Superlative Chronometer is in the order of −2/+2 seconds a day – the rate deviation tolerated by the brand name for just a finished view is noticeably more compact than that approved by COSC for Formal certification of your motion by itself. The Superlative Chronometer https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/