Calibre 2236 Is fitted using a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring contains a patented geometry that makes certain the calibre’s regularity in almost any place. Meanwhile, Graham has also ventured outside of their convenience zone with some higher echelon parts. Their Orrery Tourbillon, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/