EK1 Iron cross / Eisernes Kreuz C.E Juncker late types frame, with LDO number L/12 with brass inner core,this is a really unique piece

This the pieces a unique piece at the same time, as I haven’t really seen another similar piece yet.
Since the inner core of the cross is copper, as there were early unmarked pieces with a copper core, this would not be exceptional, but since this is the later type of the frame versions and nothing like it has been found yet. Plus, which makes it even rarer ,it is also a private sale stamped with an LDO number, which makes this unique piece even more interesting.
Manufacturer: Carl Edurard Juncker, Berlin