In the early- to mid-1930s, Gibson’s banjo line included , the most expensive non-Mastertone model; and , the least expensive Mastertone model. 9588-1 (see ) dates to circa 1930 and is an intriguing and rare factory-original combination of both of these models. For unknown reasons, a small number of banjos in lots 9588 and 9589 were made with the fiddle-shaped peghead and pearloid peghead overlay and fingerboard of the non-Mastertone . In all respects other than the peghead and fingerboard, 9588-1 is a catalog-standard TB- with a one-piece flange, forty-hole archtop tone ring, nickel-plated hardware, and mahogany wood with two whiteblackwhite purfling rings on the back of the resonator. The tailpiece is a Grover Presto and the tuners are Grover pancakes. The word Mastertone, normally inscribed in a mother-of-pearl block, is instead silkscreened on at the nineteenth fret in the same manner as the fingerboard position markers and peghead logo and ornamentation.