Calibre 2236 Is equipped using a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring provides a patented geometry that assures the calibre’s regularity in any position. Lots of of their types are available in both of those quartz and automatic variations, Normally at various rate details. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/