I tend to side with ICBently. In looking at antique swords and shorter blades from the far east, the tanto point looked much different than what is presented as that style today. I think it was more of a drop point than the sharp angle point we see now.
Nemo Me Impune Lacesset
"The trouble with our liberal friends is not that they're ignorant; it's just that they know so much that isn't so.".........Ronald Reagan