I think that it is a badik from Sumatra and a very nice one on top!  
 
I am nearly sure that the scabbard is a recent replacement, compare the patina from the handle and scabbard and note the unpurified workmanship of the scabbard. So I am unsure if the scabbard style could be a hint for the exact origin. 
 
Regards, 
Detlef
		 
		
		
		
		
		
		
		
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