gun shop
They work on, repair and modify guns and rifles
No one answer, since there is no one gun smith. Earnings will vary with the type of work that he performs, how busy he is, and the region that he is operating in.
Blue Book of Gun Values will help.
No serial number given.
You will need to buy or find a copy of the Standard Catalog of Smith and Wesson.
Call S&W with the serial number and they will tell you when it left the factory
john smith had the gun powder injury in 1609.
Depends on local law.
Take it to a gun smith.
You will have to research old gun catalogs.
Auction sites, old gun catalogs.