Hi Willem, 
 
I also believe that some of the Dohong are remounted spearheads. 
And then there seems to be another version which is more like a sword blade 
(maybe ancestor of the Bayu?). 
Probably Dohong is several, actually different, versions of old (pre 20th C) double-edged Dayak blades grouped together as one classification? 
 
Michael
		 
		
		
		
		
		
		
		
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