1972
1958
1954
You will have to call Colt with the serial number.
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.
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.
Based on proofhouse.com that trooper was the 7th made in 1967 as the productions for 1967 started with serial number 59800.
Sometime after 1978. Sn 1001L began in 1978.
your colt trooper was made by colt in 1961.
your colt trooper was produced in 1968.
Impossible to answer without the serial number.
your colt trooper was made in 1962.
1967