Calibre 2236 Is fitted having a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring provides a patented geometry that guarantees the calibre’s regularity in any position. Whilst Logan "liked Discovering and writing about" MB&F's initially chronograph – his introduction submit eloquently broke down the sophisticated watchmaking https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/