There are plenty around which are similar. I'd say Prussian origin.
Could be Russian, although i'd expect the area around the eagle to be neater. Could be Austro-Hungarian but unlikely. Could be Byzantine, although i think shape / style are more similar of Prussian / German items i've seen. For instance, if you remove the cigarette rests, you have something which resembles the Eisernes Kreuz
The eagles have been used with wings spread or withdrawn.
A nice item, Frogpatch, but possibly too generic to be pigeon holed, especially without a mark of some description