Donald Judd's badge : Robert Smithson is not my spokesman, Dwan Gallery (1966-2018)

Donald Judd's badge (mocked-up), 2018
A souvenir-work made by OBSART
Original size : unknown

More infos:

Robert Smithson (1938-1973) 
Donald Judd (1928-1994)
Moody T., Sculpture Magazine, Vol. 19, No. 5 (EN)
Exposition "10", Galerie Dwan, 4-29 oct. 1966 (FR)
Guide to the Dwan Gallery archives
Whatever Happened to Virginia Dwan?