Calibre 2236 Is equipped having a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring features a patented geometry that makes certain the calibre’s regularity in almost any situation. Even though Logan "appreciated learning and composing about" MB&F's initial chronograph – his introduction publish eloquently broke down https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/