I just received at Springfield Model 1873 "trapdoor" rifle in 45-70 as a wedding present from my uncle. I did some research to try to find some history about this particular rifle, but didn't find too much. It was owned by my great-great-grandfather, but we are unsure how he acquired it. He lived in the Pittsburgh area so he may have gotten the gun from somewhere local, but I suppose it really could have come from anywhere. The serial number is 12104. I was wondering if anybody could give me some history on this gun such as, the year it was produced and possibly where/who it was issued to. Any information would be greatly appreciated. Thanks.