The Precision of the Rolex Superlative Chronometer is from the purchase of −2/+two seconds daily – the rate deviation tolerated through the manufacturer for your concluded check out is noticeably smaller than that approved by COSC for Formal certification on the motion alone. The Superlative Chronometer position is symbolized by https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/