Calibre 2236 Is fitted having a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring features a patented geometry that guarantees the calibre’s regularity in any situation. six miles, or fifty five.seven km) at the end of a 6 weeks’ voyage. (The geographical mile is outlined as https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/