The magazine only fits some DWM Military Lugers issued during WW-1, unless it has a crown proof on the wood base. In that case, it's an Erfurt Luger magazine of the WW-1 era. The letter suffix is insignificant because it does not have a crown acceptance.
The above is confusing. These suffix ranges are found on the WW-1 pistol magazines in both DWM and Erfurt. I wonder about the Weimar era because I would look for additional markings. Maybe Weimar Police can dig into his bag of knowledge and come up with some additional information.
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