Zero postcards, 1970
Amazing set of 7 postcards. 10.5 x 14.5 cm, white text on black background mentioning historic Zero exhibitions in several cities.
Included are Dusseldorf 1959, Antwerpen 1961, Bern 1962, Den Haag 1964, Washington 1965, Bonn 1966, Krefeld 1970. The cards were addressed to hernn t.j. deelstra and sent from Dusseldorf and Krefeld in 1970.