The Precision of the Rolex Superlative Chronometer is on the purchase of −two/+2 seconds daily – the speed deviation tolerated with the brand for any finished view is appreciably scaled-down than that approved by COSC for Formal certification of the movement on your own. The Superlative Chronometer status is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/