Calibre 2236 Is fitted by using a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring features a patented geometry that assures the calibre’s regularity in almost any posture. Together with his smaller group, Ellis searched locally for manufacturers who could make the parts to his measurements. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
Brands That manufacture chronometer watches - An Overview
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