It was made in the US and was one of a plethora of unlabeled instruments made "for the trade".
"It's comparable to playing a cheese slicer."
--M. Stillion
"Bargain instruments are no bargains if you can't play them"
--J. Garber
The mandolin-banjo came on the scene in the early 20th century, so your guess is a good one. Concur with Mike E that it's a "trade" banjo, and an inexpensive one, as shown by the lack of ornamentation and the small number of brackets. You probably will never be able to attribute it to a particular maker; there were dozens of banjo builders during that era. The one thing I'd guess is that it wasn't one of the "big names."
As to value, I wouldn't expect it to price at $100 -- maybe half that. Fixing it up wouldn't be too hard; it needs a new head and a bridge. Just don't expect a fine instrument when you're done.
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