This is a 1917 French advertising poster (31.5” x 23.5”) for the French, Decelle Stationary and Printing House.
Decelle provided supplies to book stores, stationery stores, and printers all over the world. "Ils se fournissent tous chez Decelle" translates to "They all get their supplies at Decelle".

The artwork could be attributed to the artist Raoul Vion.

Stone Litho.