Iron cross 1st class iron clasp by Wilhelm Deumer, Lüdenscheid. Tombak constructed spange with soldered set up. Maker marked with the LDO code of Deumer "L/11" on the reverse. Stone mint condition with polished swastika. The clasp comes in its original box, box in very good condition. 
Very nice textbook Deumer set!
Highly unusual micro "L/11" marking!