The Precision of the Rolex Superlative Chronometer is of the get of −2/+2 seconds every day – the rate deviation tolerated with the model for just a concluded watch is appreciably lesser than that approved by COSC for Formal certification in the movement alone. The Superlative Chronometer status is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/