Revised I found the info Jerry Noble told me . As for a maker , this is my guess . Around the Knoxville area there was a maker Wm Keller. I have seen 3 myself. He made several boys rifles. After he died his son finished a boys rifle his father Wm. had started . I think it came from the Knoxville area and may be a rifle one of the Kellers built . The barrel is very close to what Wm made . Jerry said it could have been Samuel Keller, Wm Kellers father . Samuel did not sign many of his guns , if he did sign one it was S.K. We may never know who made the little gun