Hello, 
 
I'm digging up this post because I noticed that I have a very similar dagger, which has a complete and unmodified original handle and its scabbard. 
The style of the scabbard and the handle as well as the wood used are 100% Sumatran and somewhat resemble Sekin.  
I imagine that the origin cannot be very far away.
		 
		
		
		
			
		
		
		
		
		
		
		
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