AFAIK, one of the key features that identify a true mandau is that the blade is convex on one side and somewhat concave on the other. This blade appears to be rather flat. It could be a trade blade as José has suggested or simply something turned out quickly for market sale.
I didn't turn up any hits on the name. I would say that it is not common practice to engrave one's name on the blade like this.
Figures, beads, shells, etc. are often attached to mandau sheaths as talismanic power items. I would image that this figure is meant to act in that facility.
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