Calibre 2236 Is equipped with a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring has a patented geometry that makes certain the calibre’s regularity in almost any position. Along with his colleague Thomas Earnshaw, the pair would produce simplified and sensible marine chronometers. #Watches The Working https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/