Has anyone any help in putting a price on an automatic Luger I came across. It fires from a drum comes with a stock and this particular pistol has never being bought or sold. What vintage it is i,m not sure but I didnt know they came as automatics.I've seen it fired and may be able to get a photo. We are led to believe it was never mass produced but its all guessing as its origin is clouded. Any help would be appreciated...