Help requested for mini-diorama

Wilson diorama of Confederate artillery

A reader sent me this image of an old Confederate artillery diorama (25-28mm it appears) he purchased in the 1980s. It is hand-painted with excellent detail and is hand-signed “Wilson” in white ink on the lip of the hardwood base.

Does anyone know anything about this piece, especially the identity of “Wilson”? What about the figures? Any idea of the manufacturer?

Any information is appreciated!

Thanks!