German NSDAP Party Member Badge 'M1/93'

In a very good condition a German NSDAP (Nationalsozialistische Deutsche Arbeiterpartei) Party Membership Badge (or Mitglied Parteiabzeichen) The early enamel badge comes with maker marking RZM M1/93 on the reverse side and has a functional needle and catch. RZM M1/93 indicates production by Gottlieb Friedrich Keck & Sohn from Pforzheim.