Calibre 2236 Is equipped that has a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring provides a patented geometry that makes certain the calibre’s regularity in any situation. James L. January 14, 2023 The main reason I say that I'm surprised is due to Certina getting https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/