The Precision of the Rolex Superlative Chronometer is in the purchase of −two/+2 seconds per day – the speed deviation tolerated because of the brand name for any finished enjoy is appreciably scaled-down than that acknowledged by COSC for Formal certification on the movement by yourself. The Superlative Chronometer position https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/