Calibre 2236 Is fitted that has a Syloxi hairspring that is made by Rolex and patented. This silicon hairspring has a patented geometry that makes certain the calibre’s regularity in any position. At age 7 Allen fell in love by using a Timex boy's dive check out his moms and https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/