Thanks mross and Battara, these were my thoughts also.  
Presumably Native Americans jumped straight from stone and bone to iron and steel over a short time period. 
 
Does anyone else see a connection to India/Persia in the style of the marking? Or symbols of fertility? 
 
Why make an axe out of bronze with steel readily available for many centuries? 
 
Regards CC
		 
		
		
		
		
		
		
		
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