10.5x22.25" high quality silk-screened poster for March 24, 1997 concert that took place at the Michigan Theater in Ann Arbor, MI. Concert was headlined by folk rock music duo Indigo Girls. Poster features image of Mata Hari designed by Mark Arminski, whose distinctive signature appears at bottom right in blue felt tip pen. In addition, both members of the Indigo Girls - Amy Ray and Emily Saliers - have signed the poster in black felt tip pen, Ray adding peace symbol and Saliers adding heart. Poster has trace aging and corner tip wear but is still o/w Exc. From the Mark Arminski Archives and comes with a COA specially designed, signed and remarqued by him.