Calibre 2236 Is equipped with a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring includes a patented geometry that makes sure the calibre’s regularity in almost any situation. James L. January 14, 2023 The explanation I say that I'm amazed is due to Certina remaining the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/