Joe, I have an extensive file on foreign proof marks which I researched to see if I could identify that barrel proof make. Nada, zilch and nothing. I suspect it means nothing and was applied by the maker to fool a prospective owner. It has a very vague resemblance to the English proof of the late 1800s, so an uniformed buyer might think it was just a poor stamping of the English proof. …..44 Russian with a tapered, not stepped chamber ? .44 Russian is a straight case. How much taper is there? Ed.