Calibre 2236 Is equipped with a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring includes a patented geometry that ensures the calibre’s regularity in any situation. Together with his colleague Thomas Earnshaw, the pair would create simplified and functional maritime chronometers. Wade B. January thirteen, 2023 https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/