Fortis Watch Stratoliner Cool Grey Bracelet F2340007. Adding to many firsts in the history of Fortis, the redefined Stratoliner Collection features the first manufacture calibre which was custom built for space and tested in the Stratosphere. Inspired by the persistence of great visionaries, the Stratoliner is both tribute and motivation, it is the tool for those inventing tomorrow. It is the tool to go beyond the impossible.