Nice stickpin, but the LDO card does not show who the maker is. LDO means: Leistungsgemeinschaft deutscher Ordenshersteller, or Administration of German Orders Manufacturers. The LDO required manufacturers to affix their assigned "L" numbers to specified orders/decorations, (but not to all, to the dismay of modern-day collectors). A good listing of assigned LDO numbers is in the back of Angolia's Vol.1. I have a silver version, also unmarked, from a veteran back in 1975, & wish I knew the maker.