The Precision of a Rolex Superlative Chronometer is in the purchase of −2/+2 seconds each day – the speed deviation tolerated with the brand name to get a completed watch is appreciably scaled-down than that accepted by COSC for official certification of your motion by yourself. The Superlative Chronometer position https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/