NSDAP Membership Badge 'RZM M1/155'

NSDAP Membership Badge (Parteiabzeichen). The badge is a nice enameled example, it has a nice age patina and has never been cleaned nor polished, the badge is showing a darkened age-patina and scratches caused by usage and wear. The badge is maker marked with RZM (Reichszeugmeisterei) 'M1/155', indicating production by the company of 'Schwertner & Cie' from Eggenberg bei Graz (Austrian maker). The badge is of course complete with its original functional pin/catch construction. Nice example in good used condition!