This is a signed D. T. Peden (1840-1875), son of Thomas Peden (1799-1858), from the Greenville area of South Carolina. This was a family of gunsmiths, I found an elder also is listed in a census as a gunsmith, prior to Thomas. DT was Thomas' only son. He is reputed to be married in 1855, so I need to do some better geneology research on his birth years. Even then, you didn't marry at 15 very often. I estimate this rifle as being made right before the Civil War. He follows a lot of his father's style.
This rifle in one of 5 known that I found. Three are from the father, 2 from the son. The stepped buttplate and unique patchboxes are hallmarks of the family, as is the trigger guard. I believe the barrel wedge escuchions too, I need to research. It is about 62" long overall, with a 42" barrel, about 45 caliber it feels like. I hope you enjoy this SC rifle.