I have a 20ga field grade #FW115227, made around 1929 that has the correct marking for a 2 3/4" gun. 2 1/2" was normal at that time. I thought I had a photo of the marking but cannot seem to find it, I think Drew has a photo of the barrel flats in his stuff. I also have a 16ga # FW151574 (1937) that is 2 9/16, I believe that was common up to WWII.

Last edited by james-l; 11/01/12 04:08 PM.
I learn something every day, and a lot of times it's that what I learned the day before was wrong