5. How do you recognise a first edition? And the second and third editions?
The first six editions et Achterhuis can be distinguished by the colour of the author's name printed on the dust jacket. The first edition is yellow, the second edition is blue, the third edition is orange, the fourth edition is red, the fifth edition is mint green and the sixth edition is green-blue. Another distinguishing feature is the colour of the belly band, which is often missing. In the first edition, the belly band is yellow, in the second edition blue, and in the third edition orange. Subsequent editions did not have a belly band.
The first to fourth editions were printed on grey paper and bound in a simple cardboard cover with the author's name, title and publisher printed on a rectangular orange-coloured area. The fifth and sixth editions have a blue linen cover with the title Het Achterhuis in gilded letters.
The first edition is further distinguished by the statement Proloog-reeks on the half-title, i.e. the first page carrying nothing but the title of the book. Parallel to literary journal Proloog, Contact publishers had set up a series in which works by young authors could be published. Between 1945 and 1947, seven volumes appeared in the de Proloog series, including the first edition of Het Achterhuis. The statement Proloog-reeks is missing in the second and subsequent editions.