The Precision of the Rolex Superlative Chronometer is of the order of −two/+2 seconds a day – the speed deviation tolerated because of the manufacturer for the concluded view is considerably scaled-down than that accepted by COSC for Formal certification on the motion by yourself. The Superlative Chronometer status is https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/