Calibre 2236 Is fitted with a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring provides a patented geometry that makes certain the calibre’s regularity in any posture. Lange & Söhne. I’ll make clear why: the German model stepped onto the chronograph stage with their much-praised Datograph https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/