The Precision of a Rolex Superlative Chronometer is with the order of −two/+2 seconds per day – the speed deviation tolerated because of the model for the finished enjoy is noticeably lesser than that approved by COSC for Formal certification of your motion by itself. The Superlative Chronometer status is https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/