Here is a link to a picture of the a 16 ga receiver from 1923, this gun was one of the first batch shipped after FN resumed shipments to the US:

http://i301.photobucket.com/albums/nn55/decoy_1_photos/A516gastdstraightstock062.jpg

I dont have a picture of the barrel address on my "Brothers" gun but it is the early style small letter roll stamp that is on the top of the barrel.

I sent an email to Mr. Shirley (author) regarding the gun in the picture and my gun, he indicated that he was aware of another gun like the one in the picture and others like mine. If he ever updates his book in another edition these gaps will be filled in.

Jeff

Jeff