Also known as the EG 2 it also has the fame of being an authentic Eisenwerke Gaggenau product that will be at least 130 years old. The first thing to look for an authentic EG 2 is the number of pins/screws above the trigger guard. The genuine EG No 2 has three of these whereas all other versions have just two. Another easy way to tell is to look at the right hand grip screw. In the EG the screw is set in a diamond shape. Both of these features of the EG2 are clearly shown in the 1895 Eisenwerke Gaggenau catalogue. The pistol retains all its nickel. It cocks and fires perfectly with a strong spring action. See page 78 of the Collectors Guide to air pistols by Dennis E. Hiller for reference.
As this pistol is clearly pre 1939 it can be sent in the post, I will need photo ID to prove age.