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