RB-250 model, 5 string Mastertone, made in Kalamazoo USA pre 1984, most likely 1970s vintage, Mahogany neck, Ebony fretboard, Mahogany resonator, Gibson stamped tuners, Gibson gold hardware possibly added later, original nickel ‘clamshell’ tail piece included. Gibson hard case. Well played instrument with a lot of player wear, with rich, full and loud tone.