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