For the sake of historical accuracy, since I mention the Muff, it was not issued until late ‘69 at the earliest. Mike Matthews made a forerunner for Guild, the Foxey Lady(used by Robert Fripp in King Crimson early on), but I don’t know how similar the circuits are. While the Fuzzface was certainly around in 1968, who knows what kind of distribution that and the FL might have had in those days to be available in LA. As far as the 360 fuzz is concerned, that’s definitely what you hear on Sly’s ‘Dance To The Music’, right after Larry Graham sings ‘I’m gonna add some bottom’, so you might want to compare that. I think there is a current copy of that in pedal form. Not much for bass players then, and not really that many bassists using fuzz at that point(much of what you hear from that period is amp distortion). McCartney and Wyman dabbled circa ‘65/‘66; otherwise there was Graham, Tim Bogert, and the guy in The Music Machine(“Talk Talk”). Noel Redding live, maybe, kinda hard to tell from recordings.