The Precision of the Rolex Superlative Chronometer is of the get of −two/+two seconds each day – the rate deviation tolerated by the brand for just a finished observe is noticeably scaled-down than that accepted by COSC for Formal certification of the movement alone. The Superlative Chronometer status is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/