Secret Agent Man…
Colt really pioneered the modern small-frame revolver when it introduced the Detective Special, fundamentally an abbreviated Police Positive Special with a 2-inch barrel, in 1927. Introduced at the height of Prohibition and the era of the great automobile-borne gangsters of the “Roaring Twenties,” the Colt Detective soon became a hit and was successful enough to remain in production until 1995, which is one heck of a run.
Immediately after World War II, Colt pioneered making handguns with such “Atomic Age” aerospace materials as early aluminum. With the material dubbed “Coltalloy” at the time, Colt introduced an aluminum-framed variant of the popular Detective Special in 1950 named the Cobra– the company’s very first of an extensive line of “Snake Guns.”

The same footprint as the 21-ounce all-steel Detective, the Cobra lost more than a quarter-pound of weight, hitting the scales closer to 15 ounces with the same 6-shot capacity.
In 1955, Colt responded to the newly introduced and popular S&W Chief’s Special by moving to make the Cobra even more compact. Taking the aluminum-framed 6-shooter and trimming the length of the grip frame down while keeping everything else intact, the Agent was born.
More in my column at Guns.com.