Self-portrait with a portrait of his father, Dick Ket, circa 1938

Double portrait of dick ket and his father libbe ket, 1938. Date: circa 1938. Dimensions: 30.4 × 35.5 cm (11.9 × 13.9 in). Medium: chalk, charcoal, ink. Collection: Rijksmuseum. Dubbelportret van Dick Ket en zijn vader Libbe Ket, RP-T-1994-160