Original 1st printing 14 x 18" concert poster for the Rhythm Devils (featuring Mickey Hart, Bill Kreutzmann and Phil Lesh, along with Airto Moreia, Flora Purim and Michael Hinton) appearing at the Marin Civic Center in San Rafael CA from 2/13-14/1981. 

 Designer unknown/not credited, medium-thick flat index stock poster is in near mint to excellent (A-/B+ to B+) condition; aside from a thin 1&1/2" vertical crease in the bottom left/center margin and a whisper of handling wear, this example is just about as clean as can be... very sharp indeed. Unusual low-run oddball Grateful Dead side-project concert artifact, read more about the show HERE:

http://lostlivedead.blogspot.com/2010/01/rhythm-devils-marin-veterans-memorial.html