If you're big into those Texas history reenactments, it might be worth it to you to have one made. I remember seeing a big knife in the museum at the base of the San Jacinto Monument that was owned and carried by Sam Houston. I later saw that same knife at the State History Museum in Austin. It had a blade shape that was similar to the one you're using, except it was bigger. One of these guys can make you one without a guard so it'll fit in the kind of sheath you mentioned (like the sheath used by Robert Tedford in Jeremiah Johnson). They could make it with or without a bolster. I'd use that Sam Houston knife as a model, although you might not want a blade as big as the one on his knife. It would certainly qualify for being period correct.
