Calibre 2236 Is fitted with a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring contains a patented geometry that makes certain the calibre’s regularity in almost any placement. Tissot traces its prolonged history back again to 1853, when it absolutely was Started by The daddy-son staff https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/