Roly; There were pics. of my rifle and I believe Mikes on July 09, 2012 by me under Commercial Militarized Sporting Mauser. That is a good article Mike refers to.
That plaque, as far as I can tell, was about the same size and shape as a playing card. I'd would like to see a close up of that if possible and a copy of that letter for my album.
I have pics of the 3 and could Email them to you - PM your Email addy if you wish. --- John