if a single acton model then about 1893 (I think)
The year of manufacture for your pistol is 1877 .In 1878 the serial numbers started at #3000. You can contact colt and they can supply you with the date the gun was shipped from the warehouse and to where it went.
Made 1877-1909. Without more of a description the best I can estimate is 500-4000
The lower the serial number the younger the pistol is
The PY in the middle of your serial number dates your pistol to 1982.
You will have to call Colt with the serial number to find out.
Impossible to answer without the serial number.
No way to answer without the serial number.
The year of the Colt 25 pistol with the serial number 255465 varies greatly depending on the actual model of the pistol. That serial number in the model 1908 might date back to the early 1900s. That number in later models can be from the 1950s.
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.
No serial number = no answer.
Exactly how is the pistol marked? 9mm browning serial number 72C44338
Impossible to answer