I think Ron has pegged the receiver, the firing proof does look more like the Erfurt eagle than the DWM eagle. Look for Erfurt inspector marks on the frame and small frame parts, they do not show up in the photographs and may indicate that the frame is not Erfurt. It could be that the receiver/barrel is the replaced part.
The magazine marked 2/1001 is an East German police magazine. You will note that the base does not really look like aluminum, it is another alloy entirely, possibly Zamak.
--Dwight
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