[URL]http://thrillingwonder.blogspot.com/2006/12/mystery-photo-one-seriously-empowered.html[/URL]
Thus spake Buzby () unto the assembled multitudes: No, I think you'll find that that is an early attempt to fit a reverse gear to a scooter. They couldn't fit it in the gearbox, so they just used the gun's recoil to send the thing backwards. This was after all a required manouevre in the Italian army of the time.