I am uncertain whether this is, indeed, NSDAP (Nazi Party) It is dated May 1, 1921. It says (In German) : "FORWARDS TO SOCIALISM" It shows a worker, wearing an apron, with a sledge hammer in one hand, and a flag in the other. The sun is rising in the background. The badge is in very nice condition- except that the pin is missing from the back. That can be replaced, but where will you ever find another badge like this? The badge is approx. 3.7 cm long.