Calibre 2236 Is fitted which has a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring contains a patented geometry that makes certain the calibre’s regularity in almost any placement. The 3rd major move transpired within the early 1900’s. The shape of the timekeeping equipment improved in https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/