Calibre 2236 Is fitted with a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring features a patented geometry that guarantees the calibre’s regularity in almost any position. Every single of your respective watches is roofed up to a hundred and fifty% in the insured price (approximately https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/