Original 1st printing 11 x 17" concert poster for the "Northwest Music Explosion", a two-day event held at Eagles Auditorium in Seattle, WA from 7/1-2/1967, featuring appearances by the P.H. Phactor Jug Band and the Pentagon (Sat.) and West Coast Natural Gas with Canterbury Tales (Sun.). 

 Art by Chuck Trimble, image is featured on page 37 of "Split Fountain Hieroglyphics" (SFH 045).

 Medium-thin flat index stock poster is in excellent (B+) condition; aside from a hard 1" diagonal bend in the top right corner, a few ultra-light surface smudges and tiny edge dings here and there, it is an absolutely superb-looking example of this EXTREMELY obscure Eagles Auditorium poster from mid-1967.