David, Barry, & Kai, thanks for all the comments.
And to 'monkey' with the topic some more, earlier there was a comment on why is there only one such example of a proto-Philippine kris (i.e., the Bohol kalis) per my assertion or speculation.
My answer to that is that discoveries of archeological blade artifacts are really few and far between. Also, if an evolutionist would have finally found his half-ape/half-man missing link and he found only one, I don't think people will question why there is only one example. Btw, I don't believe in evolution (but that's going off-topic).
On the dating of the Bohol kalis as being supposedly no good -- because it's very wide (a 500-year range, between 10th to 15th century AD) -- I don't agree with the 'no good' objection
We have to distinguish between precision and accuracy (see illustration below).
If while traveling around New York and New Jersey I lost my bag and a reliable person told me I lost it for sure within Central Park, that tip won't certainly be no good. The info is admittedly not precise (Central Park is about 3.5 sq-km). But on the other hand the info is very accurate (at least I'd know that the bag is not in Brooklyn, and for sure it's not in Jersey). And if somebody will add that my bag was last seen at Strawberry Fields (the Lennon memorial inside Central Park), then that would not only be accurate but also very precise.
The 10th to 15th century dating is surely accurate -- there's consensus amongst experts that it's within that age range. But we need more precision as we all said. And a radiocarbon dating or any other suitable lab procedure is the next step, as far as getting a tighter age range is concerned.
So what am I trying to say? Haha, I lost my train of thought ...
PS'es --
Barry, nice examples you posted there. It's now clear that the blade profile ('waisted') used in the Bohol kalis still lives.
David, I think my primate analogy didn't come out that clearly. It's my fault. So I'll rehash the analogy, and make another post very soon (just fixing the revised 'planet of the apes'
illustration). Thanks.
Kai, and I still think it's all about definitions