Since no one has responded, let me point you in another direction.
The Gun Report has an "Accoutrements Corner", edited by Dick Salzer (703 Salerno, Sugar Land, TX 77478 or e-mail at firstname.lastname@example.org
. He is pretty knowledgeable on that sort of thing, which I am not. I assume you know or believe that it is original, so provide him any information you may have.