Fortis watch aquatis diver black chronograph 6381841 lp characterized by the high reliability required in space travel these models of the aquatis collection have the emblem of the russian space agency engraved on the base the fortis diver black is based on the first diver models from the 1940s all in black with a blue fortis like second hand as a highlight the chronograph and the day date version feature a matching divers turning bezel the diver black chronograph with the fortis leather