The MB&F HM9 Sapphire Vision Timepiece has an homage to the watch's intricate engine with a completely transparent case. Since 2018, the Horological Machine N°9, which MB&F introduced, is an outstanding timepiece honoring the Golden Era of automotive and aeronautic structure. Furthermore, the sapphire crystal shell holds inside the remarkable dual spherical propellers movement. The spherical merge together with the three-dimensional gasket and a mixture bonding. Moreover, the HM9 Timepiece Super-LumiNova hands and markers visible from the vertical time display encased with sapphire crystal. This unique and collectible watch is available in four colored editions, black, red gold, blue gold, and purple gold, and limited to only five pieces.