Original 1st printing 13 x 19&7/8" concert poster for "Spring Medicine Show", a two-day benefit for the Haight-Ashbury Free Medical Clinic, held at the Avalon Ballroom in San Francisco, CA on 5/28-29/1968.
Poster lists appearances by: Allmen Joy, Santana (Blues Band), A.B. Skhy, Phoenix, It's a Beautiful Day, Indian Head Band, Loading Zone, Linn County, Country Weather, Initial Shock, Mint Tattoo and Crystal Syphon.
Art by San Andreas Fault (Tad Hunter), image is an un-numbered part of the Family Dog series (FD-680528 in Eric King's guide, the image falls between FD numbers 120 and 121).
Medium-thick flat index stock poster is in BEAUTIFUL near mint (A-) condition; just a couple of ultra soft/nearly-invisible pinch bends and a VERY light pair of tape pulls on the reverse top margin, otherwise it is an unbeatable example of this somewhat hard-to-find late-period FD oddball.