Approximately 19,680 Model 1819 Hall rifles were manufactured between 1819-1840, and this late production example was manufactured by Harpers Ferry in the year 1839. Designed from the ground up by John Hall including the machinery and methods of manufacturing, these rifles were very innovative for the time and are considered the first firearm to successfully achieve true parts interchangeability, the first nationally adopted breech loading firearm, and also the first breech loading firearm to see widespread military use. In 1826, a government commission disassembled 100 Hall rifles, mixed up the parts, and re-assembled them on newly received stocks with no reported problems and thus confirmed Hall's success. Standard offset blade and notch sights, button head ramrod, "J. H. HALL/H. FERRY/US/1839" on the breech block.