I do rather like that piece you have posted here.
After trawling the internet for quite some time, I came to the conclusion that the "Screwdriver" shaped tang indicates a Philippine origin, but who knows where more precisely.
The shape of the sharp end is a product of function rather than ethnicity or origin and definitely a piercing form either for armour or deep penetration of a soft target.
Looking at various maps, it's a damn big area, lots of islands and many related though different cultures. It's going to be a matter of chance methinks if we ever find out more.
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