The rifle looks very much like a Tennessee rifle with its iron mountings, banana shaped iron patchbox, and initialed barrel. The gunmaker probably had the initials "J M D" while the original owner had the initials "C M." That is the traditional way to read this type of initialed barrel. There is still a lot for collectors to learn about Tennessee rifles; we do not know who all the makers are, and cannot identify all the different initials that have appeared on rifles. You have a good quality, iron mounted rifle probably from eastern Tennessee, but similar guns were made in the Appalachian Mountain areas of western North Carolina, southwestern Virginia, and perhaps northwestern South Carolina and southeastern Kentucky, all part of the hill country culture that made rather similar rifles. You could get the best, most knowledgeable help with identifying your rifle if you took it to the annual Tennessee Kentucky Rifle Show on the north edge of Knoxville just off I-75 next April. You can probably Google the name and find the show and its dates for next year. That's where the experts on this type of rifle congregate once a year, and they all love to see fresh, new rifles and help the owners with them. Shelby Gallien