Calibre 2236 Is fitted with a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring features a patented geometry that makes certain the calibre’s regularity in any situation. I agree to my private data remaining saved and accustomed to obtain the e-newsletter or other updates about Monochrome https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/