Please follow the link below for searching serial numbers of Colt firearms.
Proofhouse.com has Colt sn data.
your colt SAA if it has a serial number of 502479SA was made in 1969.
Call Colt and they will tell you.
by the serial number
about 1891
Your colt was made in 1956.
Your Colt SSA was made in 1907.
about 1928
1919
It was made in 1962.
Colt single action army with that serial number was made in 1910
all colt SAA pistols have serial numbers. If the serial number was filed off then the gun is Illegal to have, and without serial can't tell when made...............