Calibre 2236 Is fitted by using a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring contains a patented geometry that ensures the calibre’s regularity in almost any placement. Together with his colleague Thomas Earnshaw, the pair would create simplified and practical maritime chronometers. Yet another watchmaker https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/