The Precision of the Rolex Superlative Chronometer is of your purchase of −two/+2 seconds each day – the speed deviation tolerated with the manufacturer for the finished view is drastically smaller than that recognized by COSC for Formal certification with the motion by yourself. The Superlative Chronometer position is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/