The Precision of a Rolex Superlative Chronometer is from the buy of −two/+2 seconds every day – the rate deviation tolerated with the model for the completed watch is drastically more compact than that acknowledged by COSC for Formal certification on the motion alone. The Superlative Chronometer standing is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/