The Precision of the Rolex Superlative Chronometer is from the buy of −two/+two seconds every day – the rate deviation tolerated from the model for a completed watch is noticeably scaled-down than that approved by COSC for Formal certification on the movement by itself. The Superlative Chronometer position is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/