Calibre 2236 Is fitted that has a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring includes a patented geometry that makes certain the calibre’s regularity in almost any situation. Tissot traces its long heritage back to 1853, when it absolutely was founded by the father-son staff https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/