Source: http://www.aiap.it.Archivio Storico del Progetto Grafico. License: All Rights Reserved.
Indigowas drawn by André Chante (alias Andy Song) for Hollenstein Phototypo, Paris. This cover for German graphic design magazine Novum was designed by Chante himself.
The top line shows Indigo with a rainbow fill, as also seen on a German pharmacy sign. The cover of Hollenstein's specimen a record cover from 1975. Makes me wonder whether the cartoon characters from line 3 really were included in the retail version of this decorated typeface series as well!