Calibre 2236 Is equipped with a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring has a patented geometry that guarantees the calibre’s regularity in any situation. Together with his colleague Thomas Earnshaw, the pair would develop simplified and simple maritime chronometers. Public establishments such as the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/