The banjo pictured above is an original five-string RB-3 Mastertone with ball bearing tone ring, made in 1926 (see Gibson banjo serial numbers vs. factory order numbers). It conforms to standard catalog specifications for style 3 for this period with red-stained maple neck and resonator, two-piece flange, grooved tension hoop with flat hooks, nickel plating, Presto tailpiece, fiddle-shaped peghead, diamonds and squares inlay, and Brazilian rosewood fingerboard. It is pictured here with its original blue-lined hardshell case.
The original owner of this instrument was a classical banjo player and teacher in South America. I owned this banjo from November 1992 to June 1996.