The lower the serial number the younger the pistol is
The PY in the middle of your serial number dates your pistol to 1982.
Exactly how is the pistol marked? 9mm browning serial number 72C44338
No way to answer without the serial number.
Frame
No serial number = no answer.
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 tell from just the sn. if you found the serial number, you will be able to find the caliber of the pistol somewhere carved in the metal.
No serial number provided.
You will have to call Colt with the serial number to find out.
Impossible to answer without the serial number.
You can find the model and serial number by going to proofhouse.com.