You're right, John, CATHY is not a Firefly. It's a standard early M4A4 which has had a 17 pdr barrel welded to its mantlet (who knows why). I'll bet CATHY never left the country, but the museum curator could tell us more, I'm sure. 
 
I'm also sure Hanno could add some info to this discussion.
		 
		
		
		
		
		
		
			
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