Luftwaffe EM/NCO's aluminum belt buckle (Koppelschloß). Originally the EM/NCO’s buckles were produced with a silver finish until a blue/grey version was introduced around mid-1940, and a tropical olive drab version was introduced in late 1940. Nice aluminum construction box buckle showing the 1st pattern drooptail eagle. The buckle is not visible maker marked or dated. Nice original buckle in used condition!