I agree David, the blade is earlier than the rest.  MOP was actually used before WWII, but not earlier than the turn of the 20c.  However, so much MOP is a later use.  I there also agree that is maybe circa WWII MOP fittings. 
 
Also the front of the ganga is Sulu type and the blade has a little Indonesian style to it.  Still I would say Sulu region as the place of origin.
		 
		
		
		
		
		
		
		
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