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