Rw.E. = Reichswerke Erfurt, exists only 1919, 1920, than DWE without manufacturing rifles.
It's not an imperial Eagle, it's the eagle in "chicken form", only used by Erfurt, Danzig and Amberg 1919-1920.
JGA in this form was never the logo of JG.Anschtz.
M under eagle is the material proof mark since 1952, proof house Munich since 1968 is correct.
This is a postwar commercial rifle made up of leftover 98a components, made by the remnants of Erfurt.
Curious marks and I think before it's not proofed again, never fire it.
