Hello Jose,
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And you are sure that the curved back edge is not a later sharpening?
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Maybe an acid etch of the blade may give additional clues?
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This is very unusual. In every single kampilan (and traditionally) the straight part is what is sharpened.
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The straight edge of this piece is fully sharpened if I understand correctly. This tip profile is the most likely to be also sharpened: Several members of the klewang family of blades (from which the kampilan obviously originates) do exhibit a sharpened back edge along the tip. It would be nice to hear of other examples if any were known!
Regards,
Kai