Calibre 2236 Is fitted by using a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring features a patented geometry that makes certain the calibre’s regularity in almost any position. Tissot traces its very long record back to 1853, when it had been Started by the father-son https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/