The Precision of the Rolex Superlative Chronometer is of the order of −2/+2 seconds daily – the speed deviation tolerated with the manufacturer to get a concluded watch is appreciably lesser than that accepted by COSC for Formal certification from the motion alone. The Superlative Chronometer status is symbolized via https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/