Calibre 2236 Is fitted having a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring features a patented geometry that makes sure the calibre’s regularity in almost any placement. Lange & Söhne. I’ll explain why: the German brand stepped onto the chronograph phase with their Considerably-praised Datograph https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/