There might be a possible connection, but that would go way back to the early 16th century, where we have Spanish illustrations of Tagalogs, etc with "open mouth" hilts.  This might be a general Austronesian motif at one time.  It would appear that later only those on Borneo, Mindanao, and Suliwesi used the kampilan.
		 
		
		
		
		
		
		
		
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