Colt frontier scout with that serial number was made in 1962 per proofhouse.com
Don't know value but made in 1962.
Your frontier scout was made in 1963.
1966
1958
Your colt frontier scout .22 mag was made in 1962.
Produced around 1967.
Proofhouse.com has sn data.
You can look it up at proofhouse.com
@ 1958. You need to call Colt to verify.
According to www.proofhouse.com, somewhere between 1966 and 1967.
Could not find a Colt frontier scout with serial number 56599P, but a Colt frontier scout with serial number 56599F was made in 1959.
it ain't worth a monkeys left ball