The Precision of the Rolex Superlative Chronometer is from the buy of −two/+2 seconds a day – the speed deviation tolerated with the model for a concluded check out is drastically scaled-down than that recognized by COSC for official certification from the motion by itself. The Superlative Chronometer position is https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/