Hello to the forum,
To introduce myself: I have collected and written several books on vintage American air guns. My best known work is probably 75 Years of Crosman. I also wrote a book on the Benjamin Air Rifle Co.
Currently, I am working on a book concerning the famous Girardoni-made Austrian Army Repeater M1780. Doing this research has required the translation of many texts from German to English, so, please feel free to write in German, I feel very comfortable translating. Unfortunately, I do not feel comfortable writing in German.
If there are any questions on the old American air guns please ask and I will do my best.