Calibre 2236 Is equipped using a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring has a patented geometry that guarantees the calibre’s regularity in any position. British check out corporations of some time were slow to go away guiding the their hand-crafting customs for mass manufacturing. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/