Have it examined by a professional appraiser
Unless it is noted that the artwork is a print or reproduction, yes all the paintings and sculptures you see are real. If would be unethical for them to not tell you when they have a reproduction on display.
Without a detailed description of the handgun, nothing.
A good handgun.
25 ACP. Inexpensive.
Will need serial number to tell.
Only a METALLURGIST can tell if the bullet is from the 1860's or not.
Call S&W and they will tell you.
Impossible to answer until you tell if you want a handgun or long gun.
Florida does not require handgun registration, so the answer is, you don't. If you are referring to a permit to carry, check with a local gun range. They should be able to tell you how to go about it.
Call S&W and they will tell you when it left the factory.
about 1966
Inexpensive turn of the century handgun