Set of (4) original 1st/only printing 7 x 11" printer's color test proof flyers/oversized handbills for RCA Records' "Groupquake", a record company showcase featuring Autosalvage, Group Therapy, Joyfull Noise and Status Cymbal with the Joshua Light Show at New York City's legendary Fillmore East on 5/11/1968. Art by David Edward Byrd, medium-thick card stock flyers are all in near mint (A-to A-/B+) condition; slight handling and a tiny bit of surface wear at most, otherwise fine. This set originally came from the printer. Interestingly, the red/yellow proof is on a heavier, somewhat glossier stock than the other three. Go figure. Real weird Byrd artwork on this one, a variation of a similar design to the FE #5 Traffic/Blue Cheer/Iron Butterfly poster.