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