1960s Slothouber and Graatsma, Cubic multiple... Lot 6045

[1960s] Slothouber and Graatsma, Cubic multiple 'PTT telecommunicatie', ca. 1966 (1) Packing-box 10 x 10 x 11 cm, architecture board with foam filling (possibly a prototype), some corners secured with transparent tape. Contains a glossy black solid perspex cube 8.5 x 8.5 x 8.5 cm, with 2 printed texts 'PTT telecommunicatie'. Box with dents and handling wear, the cube is mint. Rare corporate commission. No specific information found, and no other copies located. (2) Catalogue 'Cubic Structure at Verfindustrie Jac Eyck Heerlen'. Nuth, Rosbeek, 1966. Staplebound, 15.5 x 15.5 cm, 16 pp. Added for reference purposes, as it features pictures of similar packing-boxes designed by Slothouber and Graatsma in the 1960s. (total 2)