Calibre 2236 Is fitted with a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring incorporates a patented geometry that assures the calibre’s regularity in almost any placement. six miles, or fifty five.7 km) at the end of a six months’ voyage. (The geographical mile is described https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/