Calibre 2236 Is equipped using a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring contains a patented geometry that guarantees the calibre’s regularity in any place. Lange & Söhne. I’ll demonstrate why: the German model stepped onto the chronograph phase with their Significantly-praised Datograph in 1999. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/