Calibre 2236 Is fitted having a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring incorporates a patented geometry that guarantees the calibre’s regularity in any situation. When approached with the correct way of thinking, that of having exciting, the model exploits a distinct segment fairly properly. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/