More info on Simon P. Hendrick ...In "Michigan Gunsmiths" by Kelly & Wiltse, they cite the 1860 Dansville, Mi census showing him as age 37, and also the 1880 census listing him as a gunsmith. The "History of Ingham & Eaton Counties, Michigan" published 1880 states, "Simon P. Hendrick from Mumfordville, Monroe Co., NY, came to Michigan in 1839 or 1840, and located, with his parents, in Hamburg, Livingston Co. In 1851 he removed to Dansville, which is now his home."
The "Michigan State Gazetteer" for 1867-8 shows him as a Dansville gunsmith listed under HENDRYYX AND FLETCHER.
I have a typical New York style mule ear over under double rifle by him. It is rather a plain gun with .40 rifled over 40 rifled 29 inch round barrels with brass fittings and a lollipop tang sight.