Serial# 153126 shows 1907 there is an F under the number. I believe this is suppose to be the grade but F was pre 1907? Same as the breech balls being 3/4". Is it possible that some of these parts are carried over from an earlier production? The serial # is on the water table,forearm, and barrel flats on the bottom side,also on the bottom side of the barrel is stamped C 4 over top of 7 W&R. On the top side of the barrel is stamped Royal Steel Hunter Arms Co. Makers, Fulton N.Y. Nice to see people willing to help track history of this shotgun.