Your rifle was made by Anthony Chamness here in Indiana at Elwood in Madison County. He was a late gunsmith, as the "heaviness" of your rifles shows, starting to work about 1858 in Elwood and working into the early 1900s. His father, Micajah Chamness, was a gunsmith who taught him the trade, and both men were expert target shooters, unbeatable in their area. If you want more information on him, Jeff Jaeger's new book, "Indiana Gunmakers,' has much more background information.
Shelby Gallien
