Calibre 2236 Is equipped having a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring has a patented geometry that guarantees the calibre’s regularity in any posture. Along with his colleague Thomas Earnshaw, the pair would produce simplified and practical maritime chronometers. #Watches The Day-Day has constantly https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/