Calibre 2236 Is fitted that has a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring contains a patented geometry that makes certain the calibre’s regularity in almost any posture. British watch organizations of time had been sluggish to depart behind the their hand-crafting customs for mass https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/