The Byrds "Mr. Tamborine Man" from 1965.
That’s a Fender electric 12-string, used as a prop by Gene Clarke for a lip-synched TV appearance; the audio you hear is the original studio recording. As McGuinn was the lead vocalist on that track, Clarke had to have something to do visually besides just shake a tambourine; although he was a guitar player, he rarely played any on stage with the original line-up. As the tune was the first thing the Byrds recorded for Columbia, and they were not exactly up to snuff as a band, producer Terry Melcher used back up
from Wrecking Crew members...McGuinn was a seasoned musician, so that is him on Ric 12, of course, and the band did vocals, but otherwise it’s Jerry Cole on second guitar, Larry Knechtel(later of Bread)on bass, Leon Russell on piano, and Hal Blaine on drums. No Bass VI. Whatever you see on old TV shots is never anything to go by.