These revolvers were manufactured c. 1876-1880s in several variations. This is an earlier open top version with the wedge near the muzzle, "scooped" cylinder flutes, and the bird's head butt. The serial number is on the right side of the butt ahead of the lanyard hole. The barrel has a rounded blade front sight and the two-line Hopkins & Allen address and patent marking on the left. The frame has "MERWIN, HULBERT & CO. N.Y./POCKET ARMY" on the left and "CALIBRE/WINCHESTER 1873" on the right. Matching assembly numbers are on the barrel, cylinder, arbor, left side of the grip frame, and inside the right grip.