Calibre 2236 Is equipped having a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring includes a patented geometry that guarantees the calibre’s regularity in almost any posture. Several in their styles are made available in the two quartz and computerized variations, Obviously at different value details. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/