Go to this website, http://stevespages.com/page7b.htm and scroll down to Colt .25 or Colt .25 hammerless and it will give you the manuals with all the instructions on how to disassemble.
If you are looking for a manual, go to the link below and scroll down to Colt .25 hammerless for a magazine try: edssportshop.com
The COLT website has the answers , not knowing which model you have-that is the best an I have =It showed me how to take mine down Colt's Manufacturing Company LLC > Media / Downloads > Manuals
No such sn in the Colt 25 series
No such sn in the Colt 25 range
Yes, Colt and others made them for Colt
Colt hammerless .25 was made in 1920
1917 for the Colt model 1908 hammerless .25
No such serial number for a Colt 25 ACP
If you are speaking about a Colt 1908 hammerless .25 , then it was made in 1917.
You can get a manual from Colt
A Colt 1908 hammerless .25 with that serial number was made in 1920.