Calibre 2236 Is fitted having a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring provides a patented geometry that makes sure the calibre’s regularity in any placement. The 3rd major action happened from the early 1900’s. The shape from the timekeeping apparatus altered in favor of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/