The regular size of the Nias dagger's blades are around 9,5" but I have an old one that is 7,5". 
I am sorry to bring out the bad news but that hilt isn't a traditional one and it seems to be made for people that enjoy travelling. For especially Nias and Batak there has been an active souvenir industry for a very long time. 
 
Michael
		 
		
		
		
		
		
		
		
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