The Precision of the Rolex Superlative Chronometer is with the purchase of −two/+2 seconds on a daily basis – the speed deviation tolerated via the manufacturer for your completed watch is appreciably scaled-down than that accepted by COSC for official certification of your motion by yourself. The Superlative Chronometer position https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/