Calibre 2236 Is fitted having a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring provides a patented geometry that assures the calibre’s regularity in any situation. Every of your watches is covered up to 150% on the insured value (around the total worth of the policy). https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/