.69 caliber. 42" round barrel secured by three flat, spring retained bands. NSN. National Armory Bright finish, iron furniture, smooth walnut stock. Single shot muzzleloading percussion altered US military musket with M1858 leaf rear sight, steel blade front sight, sling swivels and button head steel ramrod. Lock marked with a {SPREAD-WINGED EAGLE}/US forward of the hammer and in three vertical lines at the tail SPRING/FIELD/1826. Hewes & Phillips added patent breech dated 1862 with H&P mark on face of bolster. Counterpane with no visible cartouches. Altered to percussion by the firm of Hewes & Phillips of Newark, NJ and additionally modified by adding a US 1858 pattern 3-leaf rear sight at the breech but without rifling the bores. Approximately 12,000 guns were so altered with patent breeches, and long range rear sights without rifled bores, primarily for the US government. {ANTIQUE}