Hello, interesting piece indeed. Am I the only one who sees the similarity of the grip with another quite different type of Visayan bolo -see pic below-?? 
 
Also the combination of metal studs hammered into the horn in a motive and inserting a lozenge shows me an influence of Indonesia; as I have seen quite many horn snuffboxes from Indonesia with this same method of decorating (metal studs, inserted lozenge). 
 
Think these swords are very rare; I never seen one before! Anyone knows more info on them; area of use/manufacture?
		 
		
		
		
			
		
		
		
		
		
		
		
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