David, there is an old addage in gun collecting, "buy the gun, not the story". In your case, however, it seems you got both a good gun and a good story. The barrel is correctly dated for the receiver as all Smith-Corona's were manufactured in 1943. The inspector's marks in front of the floor plate belong there on an original stock. You might pick up a copy of Harrison's guide to the 1903 rifle. A lot of info, and some folks say most of it is correct. I have found it to be helpful.