Nice chopper! I am chiming in here with no real knowledge if this piece, but my gut puts me in Ian's camp, that this is probably not from the Philippines, but more likely somewhere in Indonesia.
And i will go one further to say that i do not think this is a simple farming tool, but perhaps something intended for ritual purposes. That is not because it is finely crafted or even decorated and we know tools sometimes are. But i don't really see any agricultural use for the file work (greneng for lack of the more proper term). This my have been a temple chopper for some ritual preparations. But until w find more info or other examples that is purely speculation.
