I have taken a closer look at the proof marks on this gun. There is a mark on the side flat of the barrel, "ag". Cannot find a proof mark that would match it, but I did find a German date code mark. A=0, & g=6. Now would it be 1806 or 1906? Also a circular mark on bottom of barrel, but can't make out what it is, even with my 20 power loupe. So I am leaning toward German manufacture. Jim.