Calibre 2236 Is equipped using a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring features a patented geometry that assures the calibre’s regularity in any position. In addition, all three watches take advantage of a hid attachment procedure that assures seamless Visible continuity amongst the bracelet https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/