They didn't have GoPro cameras a hundred years ago. But a vintage Leica is far more stylish anyway. It's just one of the very, very strange details on this desert-ified BMW by the surrealist Austrian workshop Traumwerk. See them all at http://www.bikeexif.com/r100gs
"The Foldover Fob is a simple way to ORGANIZE AND SILENCE keys, using hand-tooled leather, combining style with function."