That really depends on the condition. Take it to a gunsmith or appraiser or go to auctionarms.com to get an idea of what they are selling for.
Proofhouse.com has Colt sn data.
about 1959. value depends on condition
100 to multiple thousands depedning on specifics
You will have to call Colt since you did not provide the serial number.
Revolver or semi-auto?
Colt woodsman 22, about $500.
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.
You will have to call Colt since you did not provide the serial number.
Try proofhouse.com
Need to know what model before an answer can be given. assuming you are refering to a colt 45 semi-auto pistol the date would be about 1914
about 1920
1-40,9061