Hi Detlef, 
These long arrows are made by several groups in Central and Northern Luzon. If you look in Krieger’s plates elsewhere on this site you will find similar examples. I can’t recall whether these are Aeta (Negrito) or one of the more northern people such as one of the Igorot groups. I think the latter but I don’t recall exactly.  
Ian.
		 
		
		
		
		
		
		
		
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