Calibre 2236 Is equipped having a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring contains a patented geometry that guarantees the calibre’s regularity in any place. Tissot traces its lengthy record back to 1853, when it was founded by the father-son team of Charles-Félicien Tissot and https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/