Manufactured in the mid to late 1870s with the wedge near the muzzle, open top frame, "scooped" cylinder flutes, and the bird's head butt. The early serial number "272" is on the right side of the butt ahead of the lanyard hole. The barrel has a rounded blade front sight, the two-line Hopkins & Allen address and patent marking on the left, and "42" double stamped on the rear of the lug. The cylinder has "4" and a "3" stamped directly on a "2" on the rear face. "43" is also stamped on the right side of the cylinder pin at the front and the left side of the front strap under the grip. The frame has "MERWIN, HULBERT & CO. N.Y./POCKET ARMY" on the left and "CALIBRE/WINCHESTER 1873" on the right.