1864 is too early for the 41 cal. Unless it's a cap and ball 44 cal (civil war)
value is based on overall condition and gun model...............
Proofhouse.com has Colt sn data.
Need to list serial number or go to www.proofhouse.com
$3875
made about 1897
If your colt is the thunderer model (you do not say) then it was made in 1902.
Requires professional appraisal.
This pistol was made between 1935-41. Please state the condition of the pistol to get and estimate of value.
50-300 usd
Impossible to answer without the serial number. They were made between 1877 and 1912
value depends on overall condition.
Proofhouse.com has Colt sn data 100-1000 USD