Thanks for the explanation Alan. 
It seems probable that if there was a Bugis colony somewhere on Sumba they would carry keris. What I was puzzled by was if there existed a specific distinct Sumba keris culture, like what was the case in Bima, Sumbawa. 
Here is an example of the missing blade, debek/bethok, in Kai Wee's excellent Malay keris blade comparison. 
 
Michael
		 
		
		
		
			
		
		
		
		
		
		
		
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