Calibre 2236 Is fitted using a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring provides a patented geometry that guarantees the calibre’s regularity in any situation. The 3rd massive action transpired from the early 1900’s. The shape of the timekeeping equipment adjusted in favor with the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/