Hello Robert,
Ben knows his stuff and I also believe the blade is not older than the hilt. As you noted, the concave side hasn't been worked carefully which is unusual.
This obviously isn't one of those flimsy tourist toys though! What's the blade thickness?
To me it looks like a somewhat later piece for genuine use. However, I hope more of our resident mandau experts will chime in with more details and sound age estimates!
Regards,
Kai
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