Calibre 2236 Is fitted that has a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring incorporates a patented geometry that makes sure the calibre’s regularity in almost any situation. As well as his colleague Thomas Earnshaw, the pair would build simplified and practical maritime chronometers. Community https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/