Calibre 2236 Is fitted using a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring contains a patented geometry that makes sure the calibre’s regularity in almost any position. Meanwhile, Graham has also ventured beyond their ease and comfort zone with some greater echelon parts. Their Orrery https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/