This is an early NSDAP Parteiabzeichen double marked Ges. Gesch. (Gesetzlich Geschützt -> Protected by law) on the badge itself and also on the pinplate.
In good condition, but there is at the three o clock position some damage. Hard to find variation and with a cool design!
It can be dated to the period 1920-1932.
Harder to find than the many RZM badges from 1934 and later!