Thanks, and good point! Seems Gibson installed a Fuzz-Tone in a 4-string bass model even earlier. . . .
From
this page:
"Gibson began marketing the FZ-1 in 1962, the same year it offered a bass – the EB-0F – with a built-in fuzztone."
However, I did a quick search, and I wasn't able to find any mention of a fuzz-equipped bass (or even just a bass plugged into a fuzz pedal) before the Beatles' "Think For Yourself."
The
Wikipedia page for Fuzz Bass mentions Marty Robbins' "
Don't Worry" as the first recorded example of fuzz bass where the effect is created by electronic circuitry (evidently the bass was being D.I.'ed into a faulty mixer channel) rather than overdriven tubes or a damaged speaker.
The Wikipedia page for "Don't Worry" says that Grady Martin played the fuzz part on a Danelectro 6-string bass and that the song was recorded at Nashville's Quonset Hut studio.
Seems likely that, as has been repeatedly claimed, this recording was the inspiration for the circuit of Gibson's Maestro Fuzz-Tone pedal.
By the way, here's a lesser-known '60s fuzz bass cut. It was recorded in a studio on the West Coast, which was Fender territory, so the part would have been played on a Fender Bass VI, using the whammy bar. Sounds like an open D string is sounded, followed by pushing the bar down.