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