Ok I hate to be the buzz kill but all of it appears to me to be of later origin.
The blade has pointed luks (curves), the baka-baka clamps are 1960s style (as David mentioned), and the scabbard is 1950s in style. As far as mounts are concerned, the ferrule and top mount remind me of 1960s and later work.
This all being said, it is possible that this was indeed made for a datu, but in more recent years.
Also good clamshell is hard to find.
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