Ich spreche eine klein gewehr und Schrottflinted Deutsch-- list all the marks you can find and I will try to id them for you-- I have Stoeger's Shooter's Bible with several pages of German and Austrian proof marks- but complete photos would be best. Krupp Flustahl )Krupp Fluid Steel is most likely the most common marking on the barrel(s)-- might also read Krupp-Essen- Essen is the main location for the giant Krupp Steel mills in Germany.

"The field is the touchstone of the man"..