The Precision of a Rolex Superlative Chronometer is with the get of −2/+2 seconds a day – the speed deviation tolerated via the brand for a concluded view is drastically scaled-down than that accepted by COSC for official certification on the movement by itself. The Superlative Chronometer standing is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/