Amsterdam: Kunsthistorisch Instituut, 1970. Single sheet folded once [folded size 8 3/8 x 12"]. Illustrated at the front panel with a reproduction of a drawing [by Otto Piene]. With invitation to the opening [5 1/2 x 8 1/2", mimeographed from typescript] laid in.
The exhibition and opening announcement for this 1970 exhibition devoted to the Zero group. The front panel drawing is unattributed, but reproduces the work Balloon Blackberry by Otto Piene.
Old horizontal fold line, else near fine. Item #25198