What a great piece! 
 
I have seen this ukkil/okir on Maguindanao weaponry as well. 
 
Like you I wonder if this guy was a convert to Catholic Christianity (some did), or if this was a cumulation of different talismans from different places.  Did he trade in places where some of these empires touched the region (Dutch, English, China, etc.)? 
 
I also wonder if it is an early 1900s piece passed down as pusaka and later generations added to it up into WWII?
		 
		
		
		
		
		
		
		
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