Hi mross.
I can see what you mean, but I think this is probably a well forged blade. The T'boli are excellent smiths and their blades are sought out for their durability and sharpness. The lack of distal taper probably reflects the slimness of the blade to start with. Some Moro kampilan show little distal taper also.
Cleaning and etching of this blade would provide more information.
Ian.
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