The Precision of a Rolex Superlative Chronometer is with the get of −2/+2 seconds on a daily basis – the rate deviation tolerated with the manufacturer for just a concluded enjoy is noticeably scaled-down than that recognized by COSC for Formal certification of the movement by itself. The Superlative Chronometer https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/