So....the day Lennon met Berry, the bass player was using a SUNN 2000S rig.
Looks like Elephants Memory, the band that backed Lennon on many of his NYC era preformances and recordings.
Special Note: That famous quote that has been attributed to Lennon of "If they gave rock & roll another name it would be Chuck Berry".....is from this appearance and is actually READ BY LENNON OFF A TELEPROMPTER. So, while he said it, it appears to. Ot have actually been his words.
Also of Note: John Lennon and Chuck Berry are both dead, yet Yoko lives on. UGh!!https://m.youtube.com/watch?v=ZbGuxGGOIV0