Revolver or semi-auto?
You will have to call Colt since you did not provide the serial number.
1-40,9061
They refer to this handgun as the browning model BDA (browning double action auto) pistol.
You will have to call Colt since you did not provide the serial number.
The first production semi auto pistol was the Mauser c/96 "broomhandle" pistol.
Need to know caliber, barrel length and whether it is a revolver or semi-auto pistol in order to answer.
Try proofhouse.com
You probably have a Mk. I pistol, manufactured circa 1958. If this is the case, it would be a semi-auto pistol, chambered in .22 Long Rifle.
100-1000 USD or so depending on specifics
A semi auto pistol in either 45, 38, 7.65 or 9mm
your colt 25 cal semi-auto was made in 1972.