That is a tad on the long side.  A 2.5-3 inch tang would be more typical.  I don't have very many dha with a handle loose enough to remove, so I think I will try the magnet test.  Clever idea.  Ian once posted a series of blade:tang ratios, but I don't have the link.  I'll add it here if I can find it.
		 
		
		
		
		
		
		
		
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