If I had to guess without handling it, I would say this is an old nihon-to. One that has been shortened at least a few inches, cleaned harshly in the past with abrasives, rusted a bit more, cleaned again, and someone has drilled two incorrect small holes in the tang.
Of course, I could be way off base, but turning the top pic sideways it looks like a good profile. The lines are all distorted and the habaki has at the very least been sanded and buffed or something. The shortening job is odd too, not really careful. In fact, most of the lines look off. But, I'll go out on a limb and suggest it is an old one. Just my opinion.
