The Precision of a Rolex Superlative Chronometer is on the order of −two/+2 seconds every day – the rate deviation tolerated by the brand for a finished watch is noticeably more compact than that accepted by COSC for Formal certification on the motion by itself. The Superlative Chronometer status is https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/