The Precision of the Rolex Superlative Chronometer is of the get of −2/+2 seconds each day – the speed deviation tolerated through the model for just a concluded check out is noticeably smaller sized than that approved by COSC for Formal certification of your motion alone. The Superlative Chronometer status https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/