[Advertising studies] 4x: (1) Gerrit Sligte (1914-1980). "Celotex beschermt alle gebouwen

tegen hitte vocht koude lawaai. Importeurs N.V. Producten & Grondstoffen Hmij Amsterdam Rotterdam." Original design in gouache, signed bottom right, 48 x 30 cm.

(2) "Rubber rubber rubber (...). Vredestein Loosduinen." Original design in gouache on cardboard, tiny signature "E. Schaap 3de kursus" bottom left, 64 x 40 cm; (3) "Waterman's Ideal. Het Vulpenhuis Reguliersbreestraat". Original design in gouache, signed "W. Stuurman 1932" bottom right, 35.5 x 25 cm. And with 1 more by Gerrit Sligte. (total 4)