Custom Gibson (model not known) 1930 Maple (stained "dark mahogany")

Gibson 1930 Banjo
After researching the serial number inside the resonator (9597-21) and gathering as much information as possible on this beautiful instrument, here is a description of this banjo:
Manufactured in Kalamazoo, Michigan in 1930, and constructed of maple wood (which is stained “dark mahogany”), this prewar Gibson banjo was originally a 4 string tenor banjo from the Golden Years (1918-1938).  It appears that at some point the neck and peghead were changed.  With the current neck, it became a 5-string banjo and has a natural Ebony fingerboard, 22 nickel frets and mother of pearl inlay designs.  (*Please see photos. Fyi, the photos show a large black screw/nut on the upper right portion of the neck, but the screw/nut is part of the telescopic stand the banjo is resting on.)   The pot has a one-piece flange.  The banjo was refinished prior to my husband owning it, and the resonator has appliqués of shell designs on the back (please see photos).
My husband collected a number of banjos over the years, and he’s had
this one for about 10-12 years.  I've tried to include as many photos as possible for you to see this banjo's beautiful condition and that there are no obvious scratches.
The hard banjo case is included with the sale of the banjo.  Happy shopping!