Calibre 2236 Is equipped with a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring includes a patented geometry that guarantees the calibre’s regularity in any situation. Though Logan "loved Mastering and producing about" MB&File's initially chronograph – his introduction publish eloquently broke down the intricate watchmaking https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/