Without more of a description the best estimate is 500-1000
100-670 usd
Try proofhouse.com, if sn not listed, you will have to call Colt
10-800 usd
100-1000 usd
value depends on overall condition.............
50-500 usd
about 1950
1968
100-1000 USD depending on specifics
No way to answer without a serial number.
About $700-$850, depending on exact version and condition.
100-600 USD