STRUYCKEN, Peter; Carel VISSER; Bob BONIES & Hans KOETSIER. 4 cold. silkscreen prints, each signed/monogrammed in pencil and dated 1968. 500 x 500 mm each. Loose as issued in obrds. portfol. 4°. (Portfol. stained, print by Struycken w. some foxing marks, lower left corner of 2 prints a bit browned).