TWEEHUYSEN, Willem Hendrik (1921-81). (Landschap). 1967. Aquarel. 435 x 525 mm. Signed and dated in ink. Under passepartout. -- Id. (Bos). 1967. Aquarel. 430 x 525 mm. Signed and dated in ink. Under passepartout. -- Id. (Kalkoen). 1973. Cold. woodcut. Signed, dated & numb. (9/30) in pencil. Under passepartout. -- (3).