The Precision of a Rolex Superlative Chronometer is of your order of −2/+2 seconds each day – the rate deviation tolerated through the brand name for your concluded observe is noticeably lesser than that approved by COSC for Formal certification with the motion alone. The Superlative Chronometer position is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/