This Ballard 16 gauge shotgun was made between 1867-1869.
30 inch long round barrel. Serial Number 17256 marked in several places.
The right side of frame marked: Ballard’s Patent/Nov 5, 1861.
The left side of frame marked: Merrimack Arms & Mfg. Co./Newburyport, Mass.
The hammer is also marked: Patent Jan, 1864.