Here I am with some delay. To be honest, I was not aware of Fred Adolph until now, but it is undoubtedly a very nice Suhl shotgun. The engraving is excellent, unfortunately even Hendrik Frühauf can not say who was the creator.
The value, as everyone here knows, is measured by how much someone is willing to pay for it. My estimate is that the shotgun could bring about 3000 € (+-) in Germany. The problem here might also be the lack of awareness of Fred Adolph in Germany.

Waidmannsheil,
Wolfgang

http://www.hunting-heritage.com