The Precision of a Rolex Superlative Chronometer is of your order of −2/+2 seconds each day – the speed deviation tolerated by the brand for your concluded watch is substantially scaled-down than that recognized by COSC for official certification of the movement alone. The Superlative Chronometer standing is symbolized by https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/