Bob Weir of Grateful Dead original Acoustic amps poster late'60s

This is an Acoustic amplifiers promo poster for Bob Weir of the Dead issued in either 1969 or 1970 that was part of a series of cool black and white posters they put out at the time. The poster is in terrific condition with just a small paper tear (easily fixed) in the right hand corner. Measures 15 3/4 x 21. Feel free to ask any questions.