Not really alot to know. Even during the Civil War and a bit before there were tubular sights without magnification. Just Cross hairs. Some had class some did not.@Mad John that rifle is something quite impressive.
One aspect of he rifle I'm curious about is the scope. I have heard of that particular scope before, and knew they had scopes back then, but would like to know more about it.
Then came telescope sights. In the beginning of very low magnification. Advances were made. The Scope on my rifle IS NOT an antique but IS a new manufactured William Malcomb tubular telescopic full length 6x sight. Argon filled with polished coated optics. One of the BIG problems in the old days was fogged optics from condensation and humidity. Most of those original sights are just collectors items, very fragile and actually useless. If this were a vintage original the scope would be destroyed by recoil. I have one old tube scope that on somedays you can see through it, the next day ...nope.
Other than that it is a true representation of the original. In some peoples eyes that totally ruins the value of the gun... I don't think so. IF I were to sell it the scope would NOT be included. The rifle itself IS THE issue.