Colt Third Model Derringer

Origins & why it was built.
Right after the Civil War, metallic-cartridge pocket guns exploded in popularity. Colt wanted a simple, truly concealable pistol to compete with Remington’s little derringers and to capitalize on its 1870 acquisition of National Arms (a firm already making cartridge hideouts). Colt’s answer—after two short-lived earlier patterns—was the Third Model Derringer, a robust single-shot chambered in .41 rimfire. The aim was straightforward: deliver a snag-free, palm-sized, close-quarters pistol with a big bore for its size, priced and sized for civilians who wanted protection without the bulk of a revolver.

Development & dates.
The Third Model followed Colt’s First and Second Model derringers of the early 1870s. The Third Model was introduced circa 1870 and stayed in production into the early 20th century (commonly cited through the 1910s), far outlasting its predecessors and becoming Colt’s signature single-shot hideout.

Design at a glance.

• Caliber: .41 rimfire (short), a heavy, slow bullet intended for very short-range stopping effect.

• Action: single-shot, tip-up barrel released by a right-side latch; simple spur trigger; no external hammer to snag.

• Form: compact bird’s-head grip, short (about 2½”) round barrel, and the iconic script “COLT” marking on the barrel top on most examples.

• Materials/finish: brass frame usually plated (most commonly nickel), with blued or plated barrel; hard rubber or wood grips; special-order plating and engraving were available.

How it was carried.
This is a true pocket pistol. Period carry was vest or trouser pocket, a small slip-pouch, lady’s muff, boot-top, or a minimal vest holster. Its smooth profile and lack of external hammer made fast, lint-proof pocket carry practical.

How it was used.
Think arm’s-length to a few yards: a last-ditch, point-shooting arm for shopkeepers, travelers, gamblers, and anyone moving through crowded streets and saloons. The manual is simple—break the barrel, load one .41 RF, close, and press the spur trigger. It also served as a backup for lawmen and civilians who already carried a larger revolver.