Calibre 2236 Is equipped which has a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring contains a patented geometry that ensures the calibre’s regularity in any posture. Ming did not just slap the movement in a case and call it a day. The actions were overhauled, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/