Rifle with flint lock, full stock of curly maple, brass mountings, octagon-to-round barrel 42 inches long with John Derr in block letters on the top facet of the barrel. The pattern of the patch box on this rifle was also used by Mauger on a number of his products. It is likely that Derr was also engaged in another occupation, for not many of his rifles are found in collections in Pennsylvania.
