The Precision of a Rolex Superlative Chronometer is with the buy of −two/+2 seconds per day – the speed deviation tolerated via the brand for your finished look at is appreciably smaller than that approved by COSC for Formal certification of your motion alone. The Superlative Chronometer status is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/