928213 was made in 1961.
The .38 Special Trooper numbers started that year at 927901.
The "P" under the serial is an inspectors stamp, not part of the number.
A 1961 Trooper will probably be one of the early "I" frame Troopers.
In 1960 Colt discontinued the Colt 357 Model and changed the original "E" frame Trooper to the "I" frame as used on the 357 and Python.
The "E" frame Troopers had the firing pin on the hammer. The "I" frame guns had it in the frame.
I have a dark handled Colt .38 Trooper Special that i carried when working at our counties Sheriff Dept. I bought it through an inmate that was housed there and had it checked out through our State Police. I finally found the serial numbers and my serial # is 46485 and do you know what year this was produced? And approximately how much are they worth today?
46485 looks like a 1965.
The numbers started that year at 43000.
Value depends on actual condition, whether it has the original grips, whether it has Target grips or hammer or Service grips or hammer, and whether you have the original box with papers, with the overriding factor being the condition.
.38 Special versions are worth 10% less then .357 versions.
Assuming your Trooper is in about 90% original condition it would be worth around $350, and possible more depending on where it's being sold.
Standard Colt grips always had the Colt medallions.
From the late 1920's to 1955 all medallions were silver.
In 1955 the Python was introduced, and as a "Super premium" gun it got the first gold medallions.
Colt more or less followed the standard from then of the Python having gold and all others having silver, until the 1970's when you started seeing gold on other models, and then by the early 1980's everything was gold.
The only modern Colt DA revolver with no medallions were the post-1972 small "D" frames like the Detective Special with the over-sized combat grips.
To determine what grips would be on an original Trooper, look at the rear side plate screw.
If the screw is flat, it probably shipped with the Target type grips.
If the screw has a rounded head it shipped with narrow Service type grips.
In any case, the grips would have Colt medallions, and they'd be silver.
917632 was made in 1957. That would make it an "E" frame, which has the firing pin on the hammer.
All Colt medium "E&I" frame revolvers made from 1908 to 2003 used the same grips no matter what model. All these used the same frame and the grip frame area is the same on all models.
That would include the Official Police, original Trooper, Officer's Model, and Python.
Grips may require slight fitting when installing. If you got genuine Colt grips from a Python they will fit the Trooper since the frame is the same type and size.
Often all the fitting that's required is to fit the grips over the frame and give them a moderate squeeze to seat them.
903528 was made in 1954, the second year of production.
It's an "E" frame and should have the period Colt "duo-tone" finish.
The sides of the frame and outer diameter of the cylinder will be polished blue, the flutes of the cylinder and the edges of the frame and trigger guard were bead blasted to a flat black finish.
The end of the muzzle was left "in the white".
The rear sight would be the early version of the Colt Accro sight, and if early enough, the front end of the sight leaf will be rounded off instead of squared off like later versions.