Dear Alvin,
I will see what I can do.
I have several documents related to this production among them the original drawings of the Bulgarian and Russian Crests.
The bubble wrap is not from the period.
Please send to me an email to:
mauser.archive@gmail.com
in this way I can pass to you the data.
I will work on the researches for your pistols.
Cheers,
Mauro