Help Identify 1800's Pocket Watch

by Jared Honea
(Chattanooga, Tennessee, USA)

This pocket watch was given to me by my grandmother, who claimed it was her grandfathers which should date this watch into the 1800's. Other than that, I know nothing else about this watch.

However, I would like to know when it was made and by whom. There are no markings on the casing or the face. The key has a '4' stamped on it and very careful examination of the inside of the back door will show what appears to be '(ST)' and '30' stamped very small on opposite sides.

Anybody ever seen a watch like this?