Calibre 2236 Is equipped with a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring contains a patented geometry that assures the calibre’s regularity in any place. Tissot traces its extended historical past back again to 1853, when it was Established by The daddy-son group of Charles-Félicien https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/