Your colt was produced in 1971.
1-1000 USD depending on exact configuration, overall condition and accessories.
Usually more accurate than the shooter
No such weapon made.
1976
Impossible to answer without a serial number.
about 1971
Made in 1975.
you will have to call Colt. the sn you list does not follow the standard numbering procedure.
If the serial numbers starts with a "G", you have a Colt Peacemaker Buntline. The serial number you list has to two more numbers than it should have. If the sn is G62260 - it was made in 1973 If the sn is G26028 - it was made in 1971 A New Frontier Buntline would have NF in the serial number.
A Colt frontier scout .22lr with that serial number was made in 1959.
The records I have, show a Colt frontier scout .22 Q model with that serial number was made in 1959.