About the time I realised that the coin was accompanied by a Michael Freeman letter, I e mailed DNW to see if they could supply me a copy. Then when you posted the above, POete, I thought maybe they wouldn't respond, having already sent out a copy to you. But, surprisingly, they now have. They "redacted" the header and signature, thus removing the sensitive detail you refer to above. But here is the rest of the reply - all technical - which expands on what you said above:-
Second bit will have to go in a succeeding post, as there isn't enough room for the two