Calibre 2236 Is equipped having a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring contains a patented geometry that guarantees the calibre’s regularity in almost any place. Based in Henley-on-Thames, Bremont Watches have managed to put together an reliable tackle pilot watches. Originally Started in 2002, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/