The Precision of the Rolex Superlative Chronometer is of your order of −2/+2 seconds a day – the rate deviation tolerated from the brand for the finished enjoy is appreciably scaled-down than that approved by COSC for official certification of your movement alone. The Superlative Chronometer standing is symbolized from https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/