Harrock n roll:
It was drawn in 1945 for the back of the French/Belgian editions and comprised elements of all the books which had been released to date, from Congo to Red Rackham's Treasure
Just a quick update on the back-cover design Harrock is talking about here; since he made his post, more information has come to light to flesh out and illuminate the subject.
In 1945, with the albums going into colour, Charles Lesne of Casterman contacted Hergé with a request for a new image for the back cover, to replace the then-current image of Tintin and Snowy standing beneath a box ( perhaps meant to be an adevrtising sign on a wall?), with Tintin pointing at it and asking the reader if they knew about the books listed on it. This had been in place since 1937, replacing a simple box listing title without illustration, which had in 1931 replaced the blank backs of the first books.
Hergé initially was reluctant to get involved in a redesign, as he felt that the pressure of producing new episodes for his strips, and revising the exiting stories to colour, plus whatever other material was needed was quite enough work.
However, Casterman prevailed, and Hergé worked up some sketches, first as a fairly simple update of the existing cover, then getting the idea for the free-standing billboard, then finally coming up with the basics for the familiar-to-many scene of Tintin, Snowy, Haddock and Cº in a landscape leading down to the sea, with the Black Island in the distance (for some reason I've generally thought that they were on an island, but I see now that there isn't really anything that indicates that, so presumably the location shows an otherwise unrecorded park or pleasure garden in the environs of Kiltoch, on the coast of Scotland - I'm glad that they got such nice weather for it!).
A feature of the image - as Harrock says - is the inclusion of objects evoking the stories to date which would be included in the colour series (hence the lack of
Soviets), and it can be fun to spot them.
However, what wasn't evident was that initially Hergé
did include items for the then still-running but not yet collected-into-book-form adventure that would become
Crystal Balls and
Prisoners.
The design that was submitted to Casterman shows the crystal balls lying on the grass in the centre at the bottom, and an Incan statue to the bottom right hand corner.
Lesne however had reservations about the picture, which was intended to fill the entire back-cover, and so was at the time rectangular - he worried that, while the current image was no longer impressive enough, quite such an elaborate and colourful image might actually be
too eye-catching, and detract from the impact of the front covers (talk about being careful about what you wish for)!
The compromise that was arrived at was to present the new picture as an inset in the middle of the back-cover, and to leave a brown margin around it; as a further effect at this time, the image was given an irregular edge.
With the reduction in the overall size, and the new edging encroaching on the image, the initial arrangement of the design was adjusted - Ottokar's sceptre was moved up slightly, and the crystal balls and the Incan statue were removed.
I have to admit that there is some slight surmise here: I can't say that for certain that the objects weren't removed because someone felt that the lack of books with them in might be confusing, rather than there being no space for them, or that the intention was to restore them when their books came out and that didn't happen. This begs a question: if they had added back in the balls and statue, might they have continued to update the scene with new additions for future books?
Sadly, perhaps, it never happened, and the "billboard" image remained until the release of
Picaros in 1975 introduced the start of the various iterations of colour thumbnails and text in a box which remains to this day.
The full, rectangular, version of the cover was used, with Hergé's signature in the lower left corner, albeit not for albums: it was used as an advert for the albums in a Flemish Scouting magazine in 1957, then for the back of an exercise book manufactured in the late fifties.
As a final thought, it's also possible to surmise that the billboard design was prepared before work on revising
King Ottokar's Sceptre was completed, as the sceptre, even in it's new location, has not been given the wings that it gained between the B&W and colour versions.