Calibre 2236 Is fitted with a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring incorporates a patented geometry that makes sure the calibre’s regularity in almost any situation. British check out firms of time were sluggish to depart powering the their hand-crafting customs for mass output. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/