Hi Jim,
While I lack your knowledge of the decorations on hunting weapons, I'm not all that sure that the images are completely talismanic. Basically, they include a sun, a moon, an image that combines the wind and a compass rose (perhaps the winds), and a martial image combining sabers, spears, drums, and a fasces. None of these are occult, certainly. One could propose that the images are insignia for a military group, some noble or other, or even artistic license.
While I agree that serving knives typically don't have sheaths, my Korean girlfriend recently gave me this nice little korean paring knife, complete with its own sheath. She got it for a few bucks at a local oriental grocery store. She was annoyed by the paring knives in my drawer.
This is just a counter-example, but it does make the point. We're used to cheese knives coming with cheese boards, but we don't have a context on this knife, except that it was old and well-made.
I'd also note that the sheath on our mystery blade appears to be non-functional, in that it can't be hung by its chain. Unless the chain fittings have slipped forward over the years (a question for CourseEight), I'm having trouble believing that it was a field knife.
Anyway, I'm enjoying procrastinating with this topic. Thank you!
F