Tough to tell from the pics, David - you might be correct that this blade might have both sides convex: () or flat: \/ while a traditional mandau exhibits a convex+concave blade: )). (The former blade configurations would usually come by other names.)
At this very basic level of contemporary workmanship, it might not make any difference though: it seems to be a quite recent trinket for either dancing/shows or sale, I'm afraid.
IMHO, it does not make any sense to invest in completing it.
Regards,
Kai
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