The Precision of the Rolex Superlative Chronometer is on the purchase of −two/+2 seconds a day – the rate deviation tolerated via the manufacturer for any finished observe is noticeably lesser than that acknowledged by COSC for Formal certification of the movement alone. The Superlative Chronometer standing is symbolized because https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/