Check out our other listings for more! These are highly collectible museum quality prints. ITEM DESCRIPTION. Created in 2000 for a concert by The Indigo Girls at Manhattanville College, NY. This is a very rare printers proof sheet. These are how the poster comes off the lithograph press before they are trimmed to poster size. Along one edge you see smaller versions of the art called “handbills”. This is hand signed by artist Bob Masse who designed this poster. Masse is an original 1960s poster artist who has done posters for many of the legends of rock and roll.