Hugh
It is a Mauser acceptance stamp (Quality Control) from around 1937 and is the first tool to use the stick eagle design. The best book in my opinion so far to show good photos and explanations of the acceptance stamps is "The Mauser Parabellum 1930 - 1946" by Don Hallock & Joop van de Kant.
When you get a chance look at my Private Message to you.
Thanks
Ed
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