Gibson RB-4 Conversion Model 5 String Resonator Banjo (1925), made in Kalamazoo, Michigan, dark mahogany lacquer finish, laminated maple/mahogany resonator, laminated maple rim; mahogany neck with rosewood fingerboard, hard shell case.
 
Overall length is 37 3/4 in. (95.9 cm.), 11 in. (27.9 cm.) diameter head, and 3 3/4 in. (9.5 cm.) in depth, measured at side of rim. Scale length is 26 1/2 in. (673 mm.). Width of nut is 1 1/4 in. (32 mm.). This is an excellent and unusually accurate early Mastertone conversion to 5-string from tenor, using the original rim and hardware with a ball-bearing archtop tone ring and tube-and-plate flange. It has been fitted more recently with a purpose-built exact repro neck, using the correct 1925 inlay pattern including the "Mastertone" logo inlaid in the headstock instead of the engraved fingerboard block. The original parts show some use; there is some wear to the resonator back and the plating, the new neck shows virtually no use. An excellent player and a particularly attractive conversion banjo. Overall Excellent + Condition.