about 1903
Don't know value, but produced in 1912.
your colt SAA if it has a serial number of 502479SA was made in 1969.
Proofhouse.com has Colt sn data.
about 1934
by the serial number
about 1895
made about 1892
about 1957
ask colt factory at : 1-800-962-2658
The Colt Peacemaker (one of many names it was given) was one of the Single-Action Army (SAA) Colt revolvers. Production of the Colt SAA revolvers started in 1873, and ran through three generations of production. One Ended in World War Two. The last generation of Colt SAA started in 1974, and has not officially ended. With the popularity of the Colt revolver, especially with growing membership in shooting clubs like SASS (Single-Action Shooters Society), demand for the SAA is still strong, and they are still being produced.
Proofhouse.com has Colt sn tables. You can also call Colt and they will tell you.