The Precision of a Rolex Superlative Chronometer is of the get of −two/+two seconds a day – the rate deviation tolerated from the brand for a completed check out is drastically scaled-down than that acknowledged by COSC for official certification with the motion alone. The Superlative Chronometer position is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/