Calibre 2236 Is equipped having a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring includes a patented geometry that makes certain the calibre’s regularity in any posture. Quite a few in their versions are made available in both of those quartz and computerized variations, Normally at https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/