Can you post a few pictures, including one or two showing the inside of the pot and the number, and any other markings or labels?
There was a batch of TB-2's made in 1929 with batch number 9544-xx. Perhaps this is an old rim that has had modern parts installed. [??] Or a modern non-Gibson rim that was stamped with an old Gibson number.
Possibly a Retro 4? those had fiddle headstocks. I think there were about 40 of them? A picture is worth a thousand words. Sometimes more!!
Retro 4s did have fiddlecut peghead and mastertone inlaid on the peghead, however serial number does not match retro 4. Retro 4 serial numbers are R4-##-40. There were 40 made hence the 40 at the end of the serial number, however first retro 4s came out in the early 2000s (2003 I think).
So far as I know, Gibson did not use a "PAT. APPLD. FOR" stamp on any of their modern-era banjos.
While the FON is a pre-war configuration number, the font is not consistent with that of banjos with numbers close to it on the earnestbanjo website. Also, the patent stamp is in a different position.
I think that your rim is probably a modern era non-Gibson rim that has been stamped with an old style number and patent stamp. Number stamping kits are available today, and some years ago one of our suppliers used to sell a patent stamp tool.
Your banjo may be a modern RB-4 that has had the rim only changed out, or it may be a conglomeration of modern era parts, some of them produced by Gibson. Unless I'm mistaken, it did not leave the Gibson factory in its current configuration.
its a 1930 number on the rim,,,it is possible someone stuck and old rim in a new banjo ,,that number falls in the TB-1 sequences ,,so its possible,,not likely but folks looking for the holy grail sound will do alot of strange things... i am one who believes the rim makes a huge difference..so you never know.