No serial number provided.
your colt cobra was made in 1968.
Impossible to answer without the serial number.
Your best bet it to call Colt.
Don't know value, but made about 1975.
1974. All Cobra and Commando revolvers made that year began with F6 . . .
Made in 1951, second year of production.
Early 1969.
According to Proof House your gun was made in 1974.
Proofhouse.com has Colt sn tables.
The sn you list does not appear in any published data. Call Colt.
1951
About 1952.