early WWII German NSDAP Political Uniform Button (1204)

Early WWII German NSDAP Political Uniform Button, aprrox 23mm.  It depicts an early political style eagle with outstretched wings clutching a stagnant swastika in its talons, in front of a round pebbled backing.  RZM M5/71 (Overhoff & Cie. of Lüdenscheid) maker marked on reverse.