I have one my back Granddad had in his collection and would like to know more on it and purchase others. I find these fascinating. I have the book “Der Reichsrevolver und seine Varianten” by Heinrich E. Harder. (It’s in German mostly and I do not know how to read much German, some pics have English subtitles etc. would like to hear from any other collectors of these and open to anyone looking to sell any.
