Hi, probably you are interested in some closer looks and more details of this pinnacle of engineering in its day. There is a lot of information you can find at the web. So I will post here some details for potential buyers.
I have two of them: one is 4,5 mm / . 177 , the other 8mm/ .32 (?) . Both barrels are rifled. The recoil plate is bakelite and the power of the gun can be regulated. At the present time I shoot the 8 mm-version with plastic-BBs. The reservoirs are not matching numbers, because the were given back (to the dealer?) to get refilled. The power and penetration can be seen on the picture of the chip-board (shot made with lead-BB).
At one picture you can see the list of serial numbers I found out at www and auction-pictures.
I try in my humble english to answer questions....