AFAIK, this is based on a traditional Madura scabbard style (with a somewhat cubistic design). Usually, this type exhibits a distinct cross-piece (which IMVHO does not really vibe with the sandang walikat category) and added protrusions along the lower sides. 
 
I'd guess that this style with the added carving here is a later development. Any provenance details on this example, Alan? 
 
Regards, 
Kai
		 
		
		
		
		
		
		
		
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