You can get a letter from Colt.
On a Colt revolver, the serial number is generally in two places. When you open the cylinder you will find the serial number at the base of the frame & crane.
What Colt model? Serial number given, dT9T22 does not compute.
Proofhouse.com has Colt serial number tables you can look at.
if your pistol is of the model 1911 with serial number 189558 then it was made in 1917 by colt. If it is the revolver then the serial number is to high for the 1917 revolver.
Colt data at Proofhouse.com
Proofhouse.com has Colt serial number tables.
what kind of revolver?? by the way, its serial number
what model ???
It can be.
Your Colt Lawman revolver was made in the year 1972.
That Colt was made in 1891. Colt started with serial number144000 in 1992.