I have a stevens savage arms corp. double barrel 16 gauge shotgun in good condition model number is 5100. I took the barrel off and underneath was stamped U M and a letter E inside a circle with some other letters stamped on it by themselves. the UM and E were right next to each other. there was also a small Q stampd right next to where the pins are by itself. Any idea what year and what the value of this shotgun is. I did some research and found that the letter E may be for the year which would be 1953, but I am not certain. Any help please. My email is jontibdo@yahoo.com