Calibre 2236 Is fitted with a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring features a patented geometry that makes sure the calibre’s regularity in any placement. ZENITH launches the one hundred thirty five-Observatoire confined version, creating the acclaimed 135 calibre, serial winner of the international https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/