.58 caliber, 33" round barrel. Lockplate marked Robbins & Lawrence U.S. and at the rear, Windsor Vermont 1849. Left of barrel marked S.T.P. With two-piece brass patchbox, and brass hardware. Walnut stock.
The bore is slightly pitted. The barrel has a mottled brown and silver patina, which has been chemically cleaned. The barrel is also oxidized at the breech. The stock has been repaired near the upper tang.