I've had this banjo for a few years, but, like all my former banjos, which have been quite a few, it's time for something different. I got this banjo on a trade, so am not clear on its value. Any advice? 1923 Gibson. Replaced tuners with aged top quality (name I forget...could look up). Still have the original pancake tuners which I will include. Scooped. Frank Neat neck.
A 3 has a brass tube sitting on balls resting on washers. Put a mirror up there and you should see them. No springs—that was the 4.
You will see three holes on the rim where the trapdoor resonator was attached. Even if filled in, you can always find them.
Look up Buell Kazee on YouTube to see him playing one of his three 1923/4 RB-3s. Quite the frailer, he did fine without a scoop. His banjos all have the trapdoor resonator and the elevated "finger-rest" that we now call a pick guard.