John, what is the serial number of your first year 20?  Mine is #605.  No information on my gun from Browning.  I would try to get info from FN is I knew how.  My #605 is mint and may be unfired.  It is 28", solid rib, modified and full.  I bought it off the rack at Albright's in Easton.
		 
		
		
		
		
		
		
		
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