58 caliber, 12″ barrel, NSN. Iron blade front sight with folding leaf rear sight. Bright finish with single spring-retained brass barrel band. Brass forend cap and trigger guard with iron backstrap and captive ramrod. Barrel marked with “V/P/[eagle]” proofs, counterpane shows illegible inspector cartouche. Lockplate marked forward of hammer “U.S./SPRINGFIELD” with 1855 date to the rear. Butt cap marked “4” with period shoulder stock marked “15”. **Fair to good condition overall. Barrel has a pewter patination with scattered oxidation. Darkening present on lockplate with primer door requiring some effort to open. Stock shows scattered imperfections with some evidence of cleaning and sanding resulting in a nearly illegible cartouche. Action is functional with a moderately dark barrel showing some scattered pitting.