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The text from this June 1977 Guild 301-B bass advert reads:
HERE Now: Guild B- 301. The Great New Longscale Bass!
Throw away your ideas of what a bass should be like, because this is the one for now! Wide frets, curved fingerboard, Schaller M-4 machines, new pick-up, new solid brass bridge/tailpiece that gives you perfect intonation. Available fretless at no extra charge.
Guild B-301: More than iust a pretty bass. It's the first in a whole new generation of solid bodies by Guild.