Calibre 2236 Is fitted having a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring includes a patented geometry that assures the calibre’s regularity in any situation. James L. January 14, 2023 The reason I say that I am amazed is due to Certina being the main https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/