Armando Museum # CONSTANT/PERMEKE # 2004, signed, mint
Benno Wissing # Museum Boymans van Beuningen # CONSTANT / PERMEKE # 1958, B--
Constant# AQUARELLEN WATERCOLORS 1975-1995#mint,1995
Constant# SCHILDERIJEN 1940-1980 # 1980, nm
Haags Gemeentemuseum # CONSTANT, New Babylon # A1 poster, 1980, nm+
Haags Gemeentemuseum # CONSTANT, New Babylon # poster,1974, B--
Tajiri, Volten ao # TWAALF BEELDHOUWERS UIT NEDERLAND # 1964, nm
Wigley # CONSTANT , NEW BABYLON# 1998, mint
Witte de With # #1 FROM WITTE DE WITH , incl New Babylon # 1999, mint