The Precision of the Rolex Superlative Chronometer is of your order of −2/+2 seconds per day – the rate deviation tolerated through the model for any completed look at is noticeably smaller sized than that approved by COSC for Formal certification on the motion by yourself. The Superlative Chronometer position https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/