Manufactured from 1876 to the 1880s, these revolvers were known as the "Army Revolver" and had a total production of several thousand. The top of the barrel is marked with the one line Merwin Hulbert address followed by seven patent dates, and the left side is marked with the one-line Hopkins & Allen address. The serial number is marked on the butt, and the matching assembly number "2127" is marked on the rear face of the cylinder, cylinder pin, barrel lug, left side on the frame at the toe, and hand marked on the inside of the grips. The left side of the frame is absent of any caliber markings. Integral blade front sight, frame notch rear sight, open top frame, scooped cylinder flutes, blued finish with casehardened hammer and nitre blue trigger, and fitted with attractive checkered mottled colored hard rubber grip and with a lanyard ring on the butt.