Iron Cross 1st Class 1957 on Screwback. Type Deumer.

In an excellent, probably unworn condition. The core with all of the black paint. The ribbing in matt white silver and the flanges burnished and all with some patina.
Not marked but a known variation that has been attributed to the company of Wilhelm Deumer from Lüdenscheid. Still with the wartime type screwback. Three piece construction and magnetic.
Very uncommon 57er screwback