All,
The problem with identifying this, IMHO, is that we are dealing with a "secondary" proof...these are markings that were applied to captured/requisitioned arms that were intended to be issued as substitutes for military standard issue. <img border="0" alt="[crying]" title="" src="graemlins/crying.gif" />
This is a field that is extremely esoteric and very little exists in secondary sources (books), as this kind of research is highly specialized and requires years of research in foreign language archives to accomplish.
Wish I had the resources to devote the rest of my time on earth to doing and documenting this; it is going to be a lifetime work for someone. <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />
Tom A