Thanks very much for the very colorful input guys!!! Especially Ariels hallucinations!!
I think everybodys observations all sound extremely plausible, and I very much appreciate the detail in noting the variations applied to these heraldic eagles.
It seems often these military blades have interestingly applied cyphers and motif on the blades, often loosely applied interpretations of regalia and heraldic devices. With the obvious degree of license seen with such decoration, it would be difficult to assign the sabre to a particular country with any certainty. Given the commercial enterprise of Solingen, this sabre might have found its way to any of the powers suggested, and the loosely applied eagle engraved on the blade. Typologically, it remains in my opinion, one of the Prussian sabres as suggested.
All best regards,
Jim