Curiouser and curiouser.
Other than claiming a Malay origin, did the seller provide any provenance? I'm unaware of any sword of this form originating from a Malay culture, but it's possible this traveled down through the peninsula on its way to you.
I think this blade has been shortened, but I'm far from certain. I've got a few dha with squared or convex tips that have a wide fuller extending through the tip. However, your scabbard is a bit long for the blade, and I think I detect a slight upcurve to the bottom edge of the fuller which might have indicated the beginning of fuller "resolution" if the blade were originally longer.
I think Mark may have a sword with a very similar blade.
The peg might have been placed to repair the scabbard (do I see a crack in the wood?). I've never seen a dha of this length and a chape cap with such a peg. When I have seen them, they usually appear on knife-sized weapons, or occasionally on newer, lower quality swords. This is not one of those.
