Calibre 2236 Is fitted using a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring has a patented geometry that makes sure the calibre’s regularity in almost any placement. Together with his colleague Thomas Earnshaw, the pair would produce simplified and practical maritime chronometers. To ask for https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/