Calibre 2236 Is fitted which has a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring features a patented geometry that guarantees the calibre’s regularity in almost any situation. Desirous to find out if your favorite British watchmaker manufactured our checklist? Use the back links above to https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/