Original 18&3/4 x 22&3/8" mixed-media production artwork (pen/ink/photostat w/two hand-cut rubylith overlays on thick Crescent illustration board) for concert poster for Mountain (featuring Leslie West) appearing with Mylon at Finch Field House on the campus of the Central Michigan University in Mt. Pleasant, MI on 9/23/1971 and at Hill Auditorium on the campus of the University of Michigan in Ann Arbor, MI on 9/24/1971. (*also advertises B.B. King and Howlin' Wolf appearing at Hill on 10/8/1971 along the bottom margin).

 Art by Gary Grimshaw, artwork is in good condition (as it is a one-of-a-kind original, a letter grade doesn't really apply here); there are a few bits of old yellowed tape and tape marks/hand-written printer's note around the outer margin area, the rubylith overlays are hand-cut and have horizontal bends near the bottom and the venue-information paste-ons are VERY loosely attached, but it's all there. 

 Gary Grimshaw artwork from this era is more or less NON-EXISTENT, this is one of the oldest pieces (of maybe 3 total) that I have come across. GREAT-LOOKING piece!