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I'm pretty sure this picture is from 10 December 1964. It was during this session that the Zombies received an award from Cash Box for the chart success of "She's Not There," so there was a bit of press coverage and a series of photographs. Of course, "Gotta Get a Hold of Myself" wasn't recorded until 1966 (4 May, according to the liner notes of The Decca Stereo Anthology), but this picture proves that Argent had a volume pedal for his Continental.
I made an Instagram post about this to try to demonstrate it: