Pair of 4-5/8x7" postcards for Feb. 23, 1970 benefit concert for The Grateful Dead that took place at Winterland in San Francisco, CA. Concert featured Jefferson Airplane, Quicksilver Messenger Service, Santana, It's A Beautiful Day as well as Dan Hick & His Hot Licks. Postcards each feature same art by Randy Tuten depicting The Phantom of the Opera as Red Death. One postcard features color design w/skull bkg. while other features just art w/o bkg. Both have blank backs. Color variety has two minute spots of staining at bottom corners, o/w postcards are Exc.