A nice original WWII German Municipal Police shako eagle here. Die stamped aluminum construction with a silver wash. One prong remaining on the reverse. Maker marked in the center of the symbol for "CTD" (Christian Theodore Dicke, Lüdenscheid).
 
Gemeindepolizei (GemPo) is the German name for a municipal law enforcement agency. Municipalities with more than 2,000 residents, not having a state police presence, had to have a municipal police department. The mayors were police commissioners. Under them the municipal police departments were led by professional chiefs of police. Towns with over 10,000 residents having a municipal police department were also obliged to have a municipal criminal investigation division.