The Precision of a Rolex Superlative Chronometer is with the order of −2/+2 seconds per day – the rate deviation tolerated with the model for the finished view is drastically more compact than that acknowledged by COSC for Formal certification of the motion alone. The Superlative Chronometer position is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/