Piet Zwart (1885-1977) Port. Brick house. Letter of paper. Portrait. Children, c. 1930. Six period silver proofs on Velox paper (3). Stamped "Piet Zwart", handwritten annotations and cropping instructions on the verses. Formats: from 5.7 x 9 to 18 x 13 cmPiet Zwart (1885-1977 ) Port . Brick house. Letter of paper. Portrait. Children, c. 1930. Six vintage gelatin silver prints on Velox paper (3). Stamp "Piet Zwart", handwritten annotations and crop marks on verso. Dimensions : from 5.7 x 9 to 18 x 13 cm