Calibre 2236 Is fitted with a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring includes a patented geometry that guarantees the calibre’s regularity in any situation. Lange & Söhne. I’ll explain why: the German brand stepped onto the chronograph stage with their A lot-praised Datograph in https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/