Do you remember Hervé Morvan ?
Hervé Movan was born in 1917 in Plougastel-Daoulas and died in 1980.
He was a French decorator and illustrator. He designed more than 150 movie posters and was very known for realised Banania's stylized design in the 50's.
See more Banania's advertisings here : http://www.lesartsdecoratifs.fr/francais/publicite/collections-97/l-univers-de-la-publicite/marques-et-personnages/banania-1890