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