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