The Precision of a Rolex Superlative Chronometer is from the order of −2/+2 seconds on a daily basis – the rate deviation tolerated through the brand for any concluded view is appreciably scaled-down than that acknowledged by COSC for Formal certification with the movement by itself. The Superlative Chronometer position https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/