Mike,
The Wiesbaden Rod and Gun Club had an "in house " gunsmith immediately after the war, but I'm not sure about in 1976. I was in Germany then but didn't visit the Wiesbaden Club. As President of the north Bavarian area clubs, I visited all the clubs there and only one had a gunsmith (who was an American member). By that time most large towns had A civilian gunsmith in the area. Maybe someone that was a member at Wiesbaden will see and answer your question.
Mike