Calibre 2236 Is fitted having a Syloxi hairspring that is produced by Rolex and patented. This silicon hairspring features a patented geometry that makes sure the calibre’s regularity in any placement. At age 7 Allen fell in like having a Timex boy's dive view his dad and mom gave him, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/