The Precision of the Rolex Superlative Chronometer is from the get of −2/+2 seconds per day – the rate deviation tolerated via the brand for just a concluded check out is significantly scaled-down than that recognized by COSC for Formal certification of the movement by yourself. The Superlative Chronometer position https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/