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					Originally Posted by Indianajones
					
				 Roy, I happen to stumble upon this piece which has the similar features on the blade and indeed this piece I would also ascribe to the Iban of Sarawak, and than to the North of their region(close to the Murut region). See that this blade also lacks the 'concaveness'. | 
	
 Best way to note concaveness is seeing both sides of the blade.
But this example from Ashoka arts is clearly concave imho.