I had a late 1935 vintage New Ithaca Field Grade, 16-gauge, with 28-inch barrels, and it only weighed 6 pounds 7 ounces.   
 
Ithaca did make some very light weight guns in the early years of the Flues model.  By the mid-1920s, Ithaca had beefed up their Flues doubles quite a bit. In the 1912 through at least 1915 Ithaca catalogues they give their smallbore weights as -- 
 
16-ga 5 3/4 to 6 1/4  
20-ga 5 1/4 to 5 3/4 
28-ga 4 3/4 to 5 1/4  
 
In the July 1919, Ithaca catalogue -- 
 
16-ga 5 lbs. 14 ozs. to 6 1/2 
20-ga 5 1/2 to 6 
28-ga 5 to 5 1/2 
 
In the December 1, 1919, Ithaca catalogue -- 
 
16-ga 6 to 6 3/4 
20-ga 5 3/4 to 6 
28-ga 5 1/4 to 5 3/4 
 
In the 1925 Ithaca catalogue -- 
 
16-ga 6 1/4 to 6 3/4 
20-ga 6 to 6 1/2 
28-ga 5 3/4 to 6 1/4
		 
		
		
		
		
		
		
		
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