The Precision of a Rolex Superlative Chronometer is of your buy of −2/+2 seconds each day – the speed deviation tolerated by the manufacturer for any completed observe is noticeably scaled-down than that accepted by COSC for official certification from the movement on your own. The Superlative Chronometer status is https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/