Winchester M1897 12GA. 20" barrel, CYL. #C 168,849. Its been used hard, touched up with cold blued long ago. The stock has also been cut off by 1 1/4", replaced metal butplate. I got it at shooter price, so I thought I can't get hurt. The different thing is the "U.S." stamp under serial #. It looks old but its not like any observed? What do you think?? TIA!