Nice piece with original patina. OK, not a trousse piece, but NOT an asparagus knife either!
The handle/hilt not quite a perfect fit for the tang, so probably replaced in its working life. So it still must remain in that fuzzy catagory of 'old sword', but a nice one. Could be a big old Confederate bowie/sword (yes, they had some this length), could be a Southwestern Colonial sword/machete type, etc,etc. Nice find.