We have a L.C. Smith 10 gauge Rabbit Eared Double Barrel shotgun. I have read enough to know where to find all the numbers and they are as followed on one side is 9416 A - on the other side is August 31, 1875 patent date under that is the date January 28, 1878. We don't know where to find the serial #. There is some numbers between the barrel but they are not legible. We have someone who wants to purchase the gun but we don't know the worth. Normal wear but still very functional. It has the trigger release. The person wanting to buy it ask if we knew if it had DEMASK STEEL barrels... How would we find out? Thanks for any info I can get