Would need model name to answer.
Serial number is needed to answer.
Impossible to answer without the serial number.
If you are looking for when made--see below: The Colt police positive .38 & banker's special with that serial # was made in 1940. The Colt police positive special & detective special with that serial # was made in 1930.
A Colt police positive special with that serial # was made around 1952.
About 1913 for a Colt police positive special with that serial number.
Per proofhouse.com , with that serial number, it was made in 1977.
Impossible to answer without the serial number.
A Colt police positive .38/bankers special with that serial number was made in 1934. A Colt police positive special/detective special with that serial number was made in 1928.
If that serial is correct, the gun was made in 1933.
A Colt police positive .38 with that serial number was made in 1930. A Colt police positive special with that serial number was made in 1928.
A Colt police positive .38 with that serial number was made in 1931 and a Colt police positive special with that serial number was made in 1928.
I would say that with the serial number 1321XX,we are looking at your shotgun being made by ithaca(who made the lefever nitro special) in 1924.