The Precision of the Rolex Superlative Chronometer is on the buy of −2/+2 seconds each day – the speed deviation tolerated through the manufacturer for any concluded watch is noticeably scaled-down than that acknowledged by COSC for Formal certification from the movement by itself. The Superlative Chronometer position is symbolized https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/