100-400 USD depending on condition.
Provide a detailed description of ALL markings, serial number, model number.
You will have to call S&W to find out.
You can't tell the model number by this serial number.
@1976.
Impossible to answer without the serial number.
Call S&W and they will tell you.
The lower the serial number the younger the pistol is
The PY in the middle of your serial number dates your pistol to 1982.
Can't be answered without a DETAILED descripiton of ALL markings.
You will have to call S&W
In order to tell how old your Colt 25 semi auto pistol is, you will need to offer the serial number. This number gives you an idea of when the pistol was manufactured.
Impossible to answer without the serial number.