Calibre 2236 Is equipped that has a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring provides a patented geometry that guarantees the calibre’s regularity in almost any posture. In the meantime, Graham has also ventured outside of their convenience zone with some higher echelon parts. Their https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/