James, I sent you a personal message, perhaps we can get together some time. Sorry I mi8sunderstood your initial request.
I have not come up with any information on original makers in and around Cameron Co. When Samuel McClay made his survey in 1790, he traveled a few miles up the first fork and declared it a "Howling wilderness." MC Clay's journal is a good read and is available from Wennawoods press. The guns from the period that i have discovered in this area were been built south and east and carried in. I have found guns by John Dreisbauch, John Roop, and Joe Long. Several later period Harter ( Lock haven) doubles a few perch belly percussions probably from New York. Russell Harriger's book Longrifles of Elk, Jefferson and Clarion Cos. is a good reference and for nearby gunmakers.
Best wishes
Ron