After reading the threads of sumbawa keris by Kai Wee, I think khalifah muda could be right. It is perhaps a sumbawa piece. 
 
Gustav's triple sogokan and Andi's (sipakatuo) blade also looks like a close call, and shows me how diverse a sumbawa can be, in styles and dapurs.
		 
		
		
		
		
		
		
		
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