Hi Michael is that an coin  under the handle we see this a lot in Borneo the motif under the handle I never did see that used in Sumatra . 
I will go back to the museum as soon as I have time to make an full picture.  
 
If you visit the Netherlands I can take you to this museum depot that closed in 2004 . 
It has an old collection never see weapons like it before.
		 
		
		
		
			
		
		
		
		
		
		
		
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