Envelope stamped "DO NOT OPEN" on both sides. The back contains the artist's signature over the flap. The seal has not been broken so contents are unknown.
Citation:
Guy Bleus. Guy Bleus Mail Art to John Held Jr., 1990. John Held papers relating to mail art, 1947-2018. Archives of American Art, Smithsonian Institution.
Use Note:
Current copyright status is undetermined
Location Note:
Archives of American Art, Smithsonian Institution Washington, D.C. 20560