Calibre 2236 Is fitted with a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring has a patented geometry that makes sure the calibre’s regularity in almost any placement. Moreover, all a few watches reap the benefits of a hid attachment method that guarantees seamless visual continuity https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/