NSDAP Party Badge 17 mm (!), Maker Steinhauer & Lück, RZM and Ges. Gesch. (!)

Small 17mm size and in a very good, slightly worn condition, the enamel without damage.
Marked on the reverse with a stylised „SL“ for the company of Steinhauer & Lück from Lüdenscheid also the code „RZM 63“ for Steinhauer & Lück and the German patent mark „Ges. Gesch.“ for gesetzlich geschützt.
A very difficult to find variant from the transitional period from „Ges. Gesch“ to „RZM „.