[Bushwhacker]

I too, have a couple with mystery markings that I could find no reference to; finally my curiousity got to me and I sent for factory letters. If you want to spend the dough, it's sort of like a grab bag.

Was it worth it for me? In one case, yes; and in another the letter raised more questions than answers which has had me sending letters to libraries in NY for info, etc.

Maybe also try contacting Century Arms. Good Luck.