If the gun appears unfired or factory fired only and does include the factory colt box and paperwork, it would typically be worth somewhere between $4500-$5000 in mint condition. I have a consecutive numbered set of Boa's myself (one 4" and one 6") that are pristine and only factory fired and they are only going to continue to increase in value.
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
value depends on overall condition...........
10-1000 USD depending on specifics.
value depends on overall condition..............