Original 1st printing 13&5/8 x 23&1/4" concert poster for Jefferson Airplane with Quicksilver Messenger Service and Dino Valenti at the Fillmore Auditorium in San Francisco, CA from 2/3-5/1967 (also mentions the 2/5 Strike Benefit at the Fillmore with the above lineup plus Country Joe & the Fish).
Art by Wes Wilson, image is #48 in the Bill Graham/Fillmore series (OP-4 in the Eric King guide).
Medium flat vellum stock poster is in very good to excellent (B/B+ to B+) condition; there's 3-4 tiny (1/2" and under) vertical tears in the bottom center margin, a small bend in the lower left right corner, very light handling wear, a couple of tiny edge/corner dings and a trace of surface wear, otherwise fine.
Overall a very nice-looking example of the gray-lettering version of the BG 48.