Well Cassandre produced a lot of stylish posters covering some of the favourite deco choices of vintage poster collectors - trains, liners, alcohol etc. I'm not sure that the poster is a one off as I've been aware of the image for years - but it is obviously very very rare. It's advertising a french newspaper of the period; hence the graphic references to telegraph lines and Hermes the messenger. It even appears on certain medallions. As we were discussing previously, this is when posters become art and occupy a level above that of photorealism.
