Hello,
Here is a small representation of the different visor caps used by the German civil police forces between 1934 and 1945. There were various branches of the police and like the German military, each of these branches was differentiated by a different color piping.
Prior to the standardized uniform regulations of 1936 the civil police was made up of various Landespolizei, or State police agencies, each with their own distinct uniform. The largest was the Prussian Landespolizei who wore this cap:
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