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 almost any position. Located in Henley-on-Thames, Bremont Watches have managed to put alongside one another an reliable take on pilot watches. At https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/