Values are based on the actual condition, finish, box, papers, accessories, whether any modifications have been done to it since it left the factory. It is basically impossible to put a value on any firearm with just the caliber and serial number. You could be in the 50-1000 USD or more range. A hands on evaluation is needed.
value depends on overall condition..............
1895
about 1895
100-1000+ depending on exactly what it is.
If your colt is the thunderer model (you do not say) then it was made in 1902.
value depends on overall condition, model ..................
value depends on overall condition.................
Colt revolver44-40serial6423103
300-500
what model, caliber. ????????
100-1000 USD
100-1000 depending on specifics