The Precision of a Rolex Superlative Chronometer is in the order of −2/+two seconds each day – the speed deviation tolerated through the manufacturer to get a concluded observe is drastically scaled-down than that acknowledged by COSC for Formal certification of your motion alone. The Superlative Chronometer status is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/