I would suggest you contact Ken Hamilton, or Ken Gahagan. Either of these gentleman should be able to help you with some info. Knives of that type are their specialty. I would say that it is likely German due to the bird carving, but that doesn't tell you much. The sheepfoot blade was popular all over Europe during that time. It would appear to be an unusual and maybe unique piece, and in unusually good condition.
I am no expert, but a few things seem a little odd, or at least notable. The blade heel on all of these types I have seen shoulder against the bolster, and do not have that stepped contact. Most knives of this general type are relatively small, and the grip never exceeds 3 or 3 1/2" which ever was a guild standard. You gave no measurements, but the handle seems longer than that. That may mean very little, as it could have been re-handled. The silver ferrule appears longer than the few I have seen, but that also means little as I mentioned, I am no expert. Try and contact Ken Hamilton.