Based on serial # 313213, It was manufactured in 1910. (312000-315999)
about 1907
@1968
Per proofhouse.com, the Colt single action army with that serial number was made sometime after 1978.
Pre 1899
per proofhouse.com,around 1959
I assume your single action is pre-war ? If so, then made about 1907. As to the caliber, check markings on barrel. that should give the caliber.......
The Colt Single Action Army revolver with the serial number SA31171 was manufactured in 1974. The Colt Single Action Army, also known as the Colt .45, has been produced in various years since its introduction in 1873, but this specific serial number indicates a production date in the mid-1970s.
Proofhouse.com has Colt sn data.
22 cal. single action colt frontier serial# 34170K was made in 1968
A Colt single action 1860 army with that serial number was made in 1866.
The Colt Single Action Scout Buntline with the serial number 43169K was manufactured in 1970. Colt's serial number system indicates that this specific model was produced during that year. If you need more detailed information about the firearm, consulting Colt's official records or a firearms historian could be beneficial.
Depends on when it was manufactured. The original models were single action; later models were double action only (DAO).