Calibre 2236 Is fitted having a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring contains a patented geometry that ensures the calibre’s regularity in almost any place. When approached with the ideal state of mind, that of getting enjoyment, the model exploits a niche pretty proficiently. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/