M.G. 81 Schützenfibel

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Gents,

picked up this little brochure today.
I cannot find any reference except for reproductions being offered on the web.
These are of different format.
Must be quite rare, I suppose.

I would like to know how many MG81s were produced.
is the number on the front cover referring to the number of the gun?

Thanks in advance,
taube.

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One more pic.