RR, IMO most probably a wartime Deumer produced EK II, and a nice one at that !
I have the same cross (with non magnetic core) mounted on a post war medal bar...............
Prost ! Steve.
"The German Army is the perfectly adapted, perfectly running Machine. The difference is that the Germans are organised with a view to War...with the cold, hard, practical and business-like purpose of winning victories."
G.W. Steevens - The Daily Mail (1897)
Very nice bar with indeed a lovely TR made Deumer EK. Congrats on the new acquisition!