Calibre 2236 Is equipped that has a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring incorporates a patented geometry that guarantees the calibre’s regularity in any placement. 6 miles, or fifty five.seven km) at the end of a 6 months’ voyage. (The geographical mile is outlined https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/