the 'beavertail' knife is actually made from a sheep shear, it's a popular conversion in wooly areas. another thread on them here:
Linky
i note that the shear blade was made in sheffield, so it could have come from almost anywhere, US, Australia, New Zealand, etc... one more skilled could probably figure out where the stag for the grip came from.
the bowie accompanying it is made by Case & it's still available today, tho that one looks like an earlier model. here's a more current one:
the older one appears to have had some modifications to the grip by an owner to improve the grip, the originals are a bit slippery when wet.