Only 830 of these musketoons were manufactured between 1847 and 1856, and 228 of them were altered to the artillery pattern. The main differences between this pattern and the artillery pattern are the front barrel band and the special bayonet fittings for the brass hilted sword bayonets. These rare sword bayonets were only manufacture for use with this model and few survive. Note that the included example has a socket on the left side of the guard that slips over the barrel, a groove on the left that locks onto the fittings on the right side of the barrel and front band, "scaled" grip, and leaf shaped blade. The leaf shape blade makes the bayonet more suited for hacking than thrusting and was thus useful as a tool as well as a weapon. It is marked "N. P. AMES/[C]ABOTVILLE/184[?]" on the left ricasso, "JS/[?]VT" on the right ricasso, and "4," "3," and "RC" on the right left side of the guard. The musketoon is marked with "SPRING/FIELD/1854" on the tail of the lock, the eagle motif at center, "1855" on the barrel tang, "V/P/eagle head" on the barrel near the breech, "T" on the left barrel flat, "US" on the buttplate tang, and "JT" on the left stock flat.