OLD!
You will have to call Colt or provide the serial number.
Proofhouse.com has Colt sn data.
The Colt python with that serial number was produced in 1961 making it 48 years old or the Colt trooper in 1958 making it 51 years old.
10-1000 usd
100-700 USD
Proofhouse.com has Colt sn data.
Requires professional appraisal
your colt trooper mkIII was made in 1978.
Between $300 and $475.
50-500 usd
Open the cylinder- can be found stamped on the frame under the yoke.
40-400 usd