@1966
your colt trooper was made by colt in 1961.
Your colt trooper was made in 1966.
your colt trooper was made in 1962.
Your colt trooper was made by colt at the end of 1968.
What year is a trooper mark 3 serial 10192j.With the serial number that you have provided,your Colt Trooper mark III was made in the year 1975.
The information I have shows that your colt trooper was made in 1961,but it does not show the B prefix to a serial number.
made about 1965
1967
made about 1966
Trooper model or 357 model serial # 68694 was produced in 1968. made about 1969
your colt trooper mkIII was made in 1978.
Impossible to answer without a serial number