If it is a Colt woodsman or match target,sround 1949.
What is the model?
Colt data at Proofhouse.com
made about 1930
if the model 1903 hammerless then made about 1922
Need to know the model or go to proofhouse.com and look it up.
The serial number
The serial number is needed to determine the manufacture date.
100-100000 USD depending on specifics
date of manufactor can only be looked up with a serial number..............
You will have to call Colt
You will have to call Colt to find out.
I have one of these and it was manufactured on 8 March 1989.