Originally a Civil War U.S. contract 1861 muzzleloading percussion rifle-musket, this is one of approximately 2,000 converted by the Meriden Manufacturing Co. circa 1865-1867 to the Miller patent breech loading system for use with .58 rimfire ammunition. Designed and patented by William H. and George W. Miller; reference U.S. patent 47,902 dated May 23, 1865. It utilizes a unique hinged breech block that tips upward for loading and releases with a spring-loaded latch, with an arm located on the left of the breech block that trips the spring-loaded extractor. "1864" dated lock with Parkers, Snow & Co. address, the breech block is marked with Miller patent marking and Meriden manufacturer address, and numbered "27" on bottom and on the breech latch. Includes a "US" marked socket bayonet and reproduction leather sling.

Fine, with scattered minor freckling and smooth gray and brown patina, strong traces of original case colors visible in protected areas of the breech block, 50% original blue finish on the rear sight, and sharp markings and edges in the metal overall. Stock is also fine, with some scattered dents and scratches, and defined edges. Mechanically excellent. Bayonet is very good.