Calibre 2236 Is equipped by using a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring provides a patented geometry that guarantees the calibre’s regularity in almost any position. There you've it, 5 brands that have performed a large position in the development of the chronograph. When https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/