The Precision of the Rolex Superlative Chronometer is on the buy of −2/+2 seconds every day – the speed deviation tolerated because of the brand name for a completed view is drastically scaled-down than that accepted by COSC for official certification of the motion on your own. The Superlative Chronometer https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/