Calibre 2236 Is equipped that has a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring features a patented geometry that assures the calibre’s regularity in almost any place. Along with his colleague Thomas Earnshaw, the pair would create simplified and useful marine chronometers. To ask for https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/