SA (Sturmabteilung) Belt Buckle (Koppelschloß). The SA (Sturmabteilung) was originally formed in August 1921 as a protective guard unit for the political leaders of the NSDAP. The SA pattern box buckle was the first belt buckle to be introduced by the NSDAP. This is a nice early 2-piece construction buckle. The buckle is not visible maker marked. Nice example in very good condition!