Need the serial number.
your colt trooper mkIII was made in 1978.
100-500 usd
value depends on overall condition................
50-500 usd
100-400 USD depending on condition.
your colt trooper was produced in 1968.
0-550 usd
$100-$300, depending on condition and originality.
@ 1966
about $750.00
-5-500 USD or so
100-700 USD