Very nice collection of early Filipino swords, Carlos!
I agree that the other blade might well have a Lumad origin, especially Mandaya and possibly related groups; even despite figural hilts not being documented from this area - also neighbouring Visayan islands may be a possibility. Do I assume correctly though that the edge doesn't exhibit a chisel grind?
While of somewhat similar shape, I'd posit that the Luzon bolos are not as closely related. However, they may hint at an earlier ancestral blade shared more widely across the islands.
Regards,
Kai
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