I guess this is on topic but out of time frame. A friend of mine has picked up a boxed Walther/Ulm P-38 conversion set to .22 cal. None of the components are import marked and neither is the wooden box. All the serial numbered parts match. I have read that these were made for the West German police and the Bundeswehr between 1963 and the 1970's. Can anyone give me an idea of value for this item?