An O.F. Mossberg & Sons “Brownie” four-barrel pepperbox pistol, chambered in .22 caliber. The pistol features a steel or ferrous metal frame and barrel assembly, with transparent grip panels, likely an early synthetic material, revealing internal mechanisms and a brass-toned spacer. Markings include “F. MOSSBERG & SONS” and “NEW HAVEN. CONN. U.S.A.” on the left side of the frame, “Brownie” on the right side of the frame, and a patent date of “PAT JULY 27. 1920” on the right barrel assembly, dating its design to the early 20th century. The serial number “21978” is present on the butt of the grip.