This is a wonderful ORANGINA LA FIDELITE D'UNE MARQUE A UN ARTISTE tribute poster illustrating the loyalty of a brand (in this case Orangina) to an artist (Bernard Villemot).
The poster presents the artist's painted concept sketches for Orangina posters spanning the years from 1953 to 1986. Villemot died in 1989 at age 78.
Translation: The Loyalty of a Brand to an Artist French Poster.