Fortis watch aviatis aeromaster steel chronograph 6561010 l08 for pilots who spend their lives above the clouds items necessary for a hard days flying must be simple and purposeful good readability robustness anti reflective glass and a glare free case are the most important performance characteristics just like the original fortis b 42 model the 6561010 fortis aeromaster steel chronograph takes up the reins of these properties and perfects them right down to the smallest detail