First psychedelic rock poster?

This poster and card for a show at the Fillmore in San Francisco in July of 1966 is widely thought to be the first, true psychedelic poster. When I asked Wes Wilson about that in our interview with him, he did not dispute it, but he credits a printing glitch that left little white lines around the letters for the look of the poster. You can read the full interview here:

http://www.collectorsweekly.com/articles/psychedelic-poster-pioneer-wes-wilson/

Compare my card on the left, which does not have the white lines, to the poster on the right, that does. It's the little things...