What a small world, I was the one who purchased your Halger no 120, and correct I am the grandson of the Hermann Gerlich who designed the Halger guns.
I have app 10 Halger guns all O&U shot guns so I was very happy to add. the Rifle .280 all Rifels my father had was confiscated dooing WW2. One is the gun I am also interested in the storry. How did you get hold of it in the first place? I notis the Scope and Tricker has been modifird do you know if the original had the german dobble tricker?
I am still looking out for Halger guns and especialy for the cal 224 and the 335 if you know anyone I am very interested...........