The Cobra came out in 1950 as a lightweight version of the Detective
Special. Five years later the Agent came out. Basically the same as
the Cobra but the grip frame is a bit shorter, supposedly to make it
more concealable. Most of the Parkerized Agents came out in the 1980s.
The big selling feature was that all three, Detective, Cobra, and Agent
held 6 rounds vs 5 rounds offered by their competitor (S&W).
I bought mine for $250, but that was 15 years ago or so. I had the
hammer spur and the SA notch removed to render it totally DAO.
And put the Craig Spegel extended boots on to compensate for the
short grip frame.
Here, left to right, is my Agent with some of it's favorite leather.
The Agent
KD's gator trim, culver gator belt, Bear knife
Black Hills Lizard culver lizard belt, Camillus knife
PWL's 120TS Haugen belt Case knife
Heiser 457 Chic Gaylord belt Buck knife
My wife and daughter gave me the Resistol for my
27th birthday. I'm 84 now, so it's getting kinda old.