Calibre 2236 Is fitted having a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring provides a patented geometry that guarantees the calibre’s regularity in almost any position. Lange & Söhne. I’ll explain why: the German brand name stepped onto the chronograph stage with their much-praised Datograph https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/