The artist's name on the poster is not indicated. By assigning Artist Unknown to a poster it also could mean the artist used a chop mark whereby no signature is seen thus rendering the artist's identity anonymous.
Imprenta: Cootypographie Typography Workshop, France —
Cootypographie was a printing house with a history extending back to 1900. It was located at 11 Rue de Metz in Courbevoie, Île-de-France, a community situated roughly 2 kilometres Northwest of Paris.