Depends on condition and exact configuration. Value range from 100-500 USD.
Requires professional appraisal.
100-700 usd
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.
Colt data at Proofhouse.com
go to proofhouse.com they have your answer.
what is the value of a 8 3/8 inch nickel plated colt trooper
without the letter 'j', made about 1966
Unfortunately, there is no public database for newer Colt handguns. You will need to contact Colt customer service through their website.
You can get a copy of the owner's manual at: http://stevespages.com/pdf/colt_lawman_mk_iii,_trooper_mkiii.pdf
100-1000 USD
Made from 69-82 or so. Yours is in the 78-82 time frame. To narrow it down more you will have to call Colt.
300 USD give or take.
Get a lawyer. You might be in violation of federal law.