A Reich German Radio Listeners (RDR) Membership Badge

A Reich German Radio Listeners (RDR) Membership Badge - "Reichsverband Deutscher Rundfunkteilnehmer eV." Silvered bronze and enamels, marked "GES. GESCH." (Gesetzlich Geschützt) on the reverse, 19.2 mm, horizontal pinback, intact enamels, extremely fine.   Footnote: The Reich Association of German Radio Listeners (RDR) was an advocacy organization founded in 1930 and dissolved in 1936.