Gibson SG Baritone string gauge in Gibson USA Posted June 8, 2019 · Report reply Thanks! I didn't think Gibson would still have a spec page for this guitar. But even though those official specs say "13-60 gauge" nobody makes that exact size for electric guitars. I finally located some D'Addarios that are 13-62, so I guess that's close enough (surely that top string will fit in the nut properly). The previous owner said he used regular gauge (10-46) but I guess he was mistaken. It IS a "very unusual Beast," as you say.