Susan at School ads

This is from the first edition dust jacket of Susan at School.  As the series was at the height of its popularity, Collins invested a little more in the advertising by printing a picture. The cost of printing an illustration must have been astronomical in those days and had quite an impact on price. In 1958, the Collins edition of Susan at School, with colour frontispiece, cost  5s. net. In 1966, the Seagull Library edition, with the same internal illustrations but no colour frontispiece cost 4s. net. Quite a difference that colour plate made!