Calibre 2236 Is fitted using a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring features a patented geometry that assures the calibre’s regularity in almost any place. British look at companies of time had been sluggish to depart driving the their hand-crafting customs for mass production. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/