You need more than what you put down on your post.
Finish? Amount left? Blue or Nickle?
Barrel Length? Type of grips?
Is the gun(and holster) U.S.Army marked?? If it is,it will be worth more than a civilian gun in the same ship.
Bob Best has written a book on these older Colts,and should be able to give you definative answers.
Welcome to the Forum,and hope this helps.