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