your colt trooper was made in 1962.
Your colt trooper was made in 1966.
1967
Proofhouse.com has Colt sn data.
@ 1966
1974
@1966
about $750.00
@ 1977
your colt trooper mkIII was made in 1978.
The question can't be answered since a serial number was not provided.
100-700 USD