Calibre 2236 Is fitted using 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 any situation. British enjoy corporations of the time have been sluggish to leave guiding the their hand-crafting customs for mass manufacturing. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/