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 place. Lange & Söhne. I’ll explain why: the German brand stepped on to the chronograph stage with their Substantially-praised Datograph https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/