Calibre 2236 Is fitted by using a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring includes a patented geometry that ensures the calibre’s regularity in almost any situation. ZENITH launches the one hundred thirty five-Observatoire minimal version, making the acclaimed 135 calibre, serial winner with the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/