Hi Dwight,
I doubt that the crown/U proofs are eastern German, as they are mated with a reichseagle on top. The East-Geman crown/U would be applied without a reichs-eagle (for obvious reasons

).
I believe this pistol al leaste saw early (possibly pre-weimar / 1922) voluntary proofing. The Crown/N's may well be East-German and document a much later barrel replacement.