The Precision of a Rolex Superlative Chronometer is in the buy of −two/+2 seconds each day – the speed deviation tolerated from the model for any finished observe is noticeably scaled-down than that accepted by COSC for Formal certification in the movement alone. The Superlative Chronometer status is symbolized by https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/