Hi Michael I am talking about the one in the picture this one is also pictured in Hornbill and dragon from Bernard sellato . 
and the dohun you mean with the Ivory handle could be from an spearhead 
I see a few but never so big like an bayu or mandau . 
That could be why they use them for ceromonies and not for fighting because never intended to be an sword . 
And you now how big and very old spearhead could be I never see an dohun  
so big as that spearhead from the one in Kopenhagen. 
 
 
 
Ben
		 
		
		
		
		
		
		
		
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