The Precision of the Rolex Superlative Chronometer is from the order of −two/+two seconds on a daily basis – the rate deviation tolerated with the brand for the concluded enjoy is drastically scaled-down than that acknowledged by COSC for Formal certification on the motion by itself. The Superlative Chronometer position https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/