Here's a short history of it.
In the 1950's TV westerns got big and people started wanting "cowboy" guns.
Colt thought that a smaller, .22LR single action would sell.
Their first model was the Colt Frontier Scout made from 1957 to 1970.
It was made in three versions, all basically the same gun except for the material the frame was made of and cosmetic differences like the finish and the grips.
The first version had a "Q" or "F" suffix in the serial number and had an aluminum frame.
These came with an extra .22 Magnum cylinder after 1964.
The "K" suffix model had a frame made of cast Zamac (cast zinc) and was made from 1960 to 1970.
The Frontier Scout '62 had a "P" suffix.
These guns had a wide range of different finishes from full blue to bright nickel, and grips made of wood or plastic, including some with plastic "stag" grips.
Barrel lengths ranged from 4 1/2" to a Buntline model with a 9 1/2" barrel.
Colt made a large number of commemorative versions over the years, such as the Golden Spike, the Pony Express, various state anniversary models, and many more.
In 1970 Colt changed the frame material to steel with a color case hardened finish.
This was made in various models from 1970 to 1986, and was also available with adjustable sights.
These were very good quality little guns and shoot very well.
To find the year your's was made, check the serial number index here:
http://proofhouse.com/colt/
Note that right now the site is down. You can also call Colt during business hours and they'll give you the year over the phone.