1864 is too early for the 41 cal. Unless it's a cap and ball 44 cal (civil war)
Proofhouse.com has Colt sn data.
Requires professional appraisal.
Impossible to answer without the serial number. They were made between 1877 and 1912
A few hundred to multiple thousands of USD depending on condition.
value of Remington targetmaster model 41 cal 22rifle
Need to list serial number or go to www.proofhouse.com
$3875
made about 1897
By it's serial number
'da' is short for double action............................
Without seeing the gun, I'm guessing it's a Colt Lightning or Thunderer. Either way, around 1877. I have found info that all colt da 41 cal were called thunderer and any serial # 111500 or prior was made prior to 1898