The Precision of a Rolex Superlative Chronometer is in the order of −2/+two seconds every day – the speed deviation tolerated with the brand name for your finished observe is substantially scaled-down than that acknowledged by COSC for Formal certification of your movement alone. The Superlative Chronometer status is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/