A beautiful first (and only) printing of BG-48, the poster advertising Jefferson Airplane, Quicksilver Messenger Service and Dino Valenti at the Fillmore Auditorium in San Francisco in February, 1967; in near mint condition. Designed by Wes Wilson, the inventor of the psychedelic concert poster, this is an original pre-concert printing, designated by Eric King in his guide as BG-79-OP-4 (one of four pre-concert variants.) This poster comes the collection of the late Ralph J. Gleason (1917-1975;) one of the most influential jazz and pop music critics of all time. He was a central figure in the San Francisco rock scene, helped organize the Monterey Pop Festival, and co-founded Rolling Stone magazine. Bill Graham himself credited Gleason with suggesting the Fillmore Auditorium to him as a site for concerts, while the Family Dog met with Gleason at his home to discuss their idea to stage dance concerts, prior to their first show at the Longshoreman’s Hall. Gleason obtained these posters at the Fillmore after shows, and took them home, storing them carefully in his archive. This poster has never been exposed to light, and looks brand new, with some light handling and a faint crease at the bottom. This is a rare opportunity to obtain a poster from the personal collection of one of the key figures of the San Francisco Scene. On request, we will gladly provide a certificate of authenticity stating that this poster came from the Ralph J. Gleason Collection. 13 37/64′ x 23 17/32′.