That's excellent, Charles.  
The flaps on this helmet look like they're pointing opposite of the ones under discussion, to me. Anybody else seeing that? 
 
I just found a reference to one of these that weighs over 6 lbs., it looks like Sajen's example. Seems like most, if not all, of this type is cast, then.
		 
		
		
		
		
		
		
		
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