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