Original 1st printing 14&1/4 x 20" concert poster for local Bay Area garage-rockers Butch Engle & the Styx appearing with the All-Night Apothecary at the Ark in Sausalito, CA from 2/21-26/1967. Art by W. Yates, medium-thick flat vellum stock is in excellent (B+) condition; very light handling wear, a few stray age spots, a tiny tear in the right center margin and a touch of corner bumping/creasing, otherwise fine. Very cute/charming design on this oddball Ark poster-perfect for Washington's birthday.