Calibre 2236 Is fitted by using a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring incorporates a patented geometry that assures the calibre’s regularity in almost any placement. In 2022, ZENITH launched the DEFY Skyline, with its star-studded dial and modern and evocative style and design. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/