Calibre 2236 Is fitted having a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring features a patented geometry that makes sure the calibre’s regularity in any posture. To market the art of watchmaking to as many people as possible, ZENITH will become the 1st manufacture to https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/