More on the "P.M." vs "PM." discrepancy based on a quick read of the information on police unit marks...
Is it possible/plausible that a Police School was created in Muenster after the 1922 regulations were issued with the form "P.X." and before the 1930 regulations specified the form "PX."? If so, the 1922 form would probably have been used, resulting in "P.M." This would be consistent with a production date of 1927, assuming the gun was initially issued to the police.
Don
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