Colt manufactured these rifles in 1861-1865 using surplus machinery from the Robbins & Lawrence Co. that had been used to produce Pattern 1853 rifle-muskets for the British during the Crimean War. They were manufactured under contract for the Union Army as well as state units and for the commercial market. The Colt Model 1861s used the same folding leaf rear sight as the Springfield Model 1861. The hammer, bolster, barrel bands, and ramrod style introduced on the Colt Model 1861 were subsequently utilized on the Springfield Model 1863. It has the standard markings and features and is dated "1863" on the lock and "1864" on the barrel.

Very good as period nickel plated. 60% of the plating remains, and the balance has gray patina and slight pitting. The sanded and re-oiled stock is good and has small dings, scratches, and minor chips. Mechanically excellent.