The Precision of a Rolex Superlative Chronometer is from the purchase of −two/+2 seconds a day – the rate deviation tolerated via the brand for any finished check out is noticeably smaller sized than that approved by COSC for Formal certification from the movement by yourself. The Superlative Chronometer standing https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/