Check the Blue Book of Gun Values, Stanard Firearms Dicitionary or proofhouse.com
1903. Colt single action revolvers in 1903 started with serial number 238,000 and 1904 serial numbers started at 250,000.
colt fronter six shooter serial # 1186654
A Colt 1903 hammerless .32 with that serial number was made in 1919.
The Colt 1911 government model with that serial number was made in 1919,
Your colt was made in 1966.
Colt single action army with that serial number was made in 1910
The government model with that serial number was made by Colt in 1944.
A Colt challenger with that serial number was made in 1952.
A Colt police positive .22 with that serial number was made in 1914.
The records I have show a Colt Cobra with that serial number made in 1974.
You must call Colt with the serial number to find out.
Your colt trooper was made by colt at the end of 1968.
A Colt 1911 government model with that serial number was made in 1917.if you are talking about a colt single action revolver than it was made in 1894.