Jerry, you are almost certainly correct that it is DWM but there are some issues. The vertical c/N suggests it was from an Alphabet DWM. If it is matched to the frame, the frame serial number suffix will tell us when it was manufactured.
A few police continued to use the 1920 property stamp into at least the mid-1920s.
Hopefully, photos will clear things up.
P.S. I have recorded quite a few police Erfurts with 1920 property stamps. Of course, these all also have a manufacture date.
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