Calibre 2236 Is fitted with a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring features a patented geometry that makes certain the calibre’s regularity in any place. The 3rd big move happened from the early 1900’s. The form from the timekeeping equipment modified in favor of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/