I 100% agree the blade profile suggests N. American influence (Mexico, SW United States, or thereabouts).
However, am I wrong that the
buffalo horn hilt , its shape, and proportions is reminiscent of Philippine influence, as shown in the following threads:
thread 1
thread 2
thread 3
thread 4
and with a lot of similar examples,
thread 5
I fully concede that some similar knife themes would have popped up in different regions of Spanish colonial influence. Again, I feel the horn hilt leans away from a N. American origin, but perhaps an imported blade found its way onto a handle of indigenous material. I'm OK with either conclusion, but I'll have to claim another bookcase if I now have begun a collection of Mexican edged items. My wife will be much more pleased if this could stay with my Asian items