Most likely the Thunderer
The 41 Magnum is the Model 57 or 58. The Model 29 is a 44 Magnum.
The Colt DA .41 1878 model was called The Thunderer.
Colt Model 1877 "Lightning" Double Action Revolver in caliber .38 Colt and the similar revolver model "Thunderer" in caliber .41 Colt.
No
If your colt is the thunderer model (you do not say) then it was made in 1902.
On the frame
Should be about .404-.406.
value is based on overall condition and gun model...............
Model 1877 thunderer .41 with that serial number was made around 1890.
50-450 usd
depends on model and overall condition
Go to proofhouse.com. Possibly a new army & navy model .41 made about 1901.