I have three of these advertising cards for Marquise de Sévigné chocolate. The Art Nouveau design features cherubs carrying a garland of roses and a beribboned box of chocolates with a drawing of the Marquise herself in the center bottom of the frame. Verso each one bears a different historical art print, two from the 17th century and one from the 18th century. When you put in your order, please note if you have a preference for a particular print: La Confidence (left), Messeger Discret (this is the center card; a smidgen darker) or Depart the Courier (right). If you're like me, the art print takes back seat to the darling chocolate shop design. This chocolate company, still thriving today, has quite a history, founded in Royat in 1892 by Clémentine and Auguste Rouzaud. The center address you see, 11 Boulevard de la Madeleine, is the flagship store in Paris. Historical information on the history of the chocolatier couple's business is not detailed, so I can't date these cards precisely. However, at the time the cards were printed, there were three shops in Paris. "Between 1900 and 1914, the couple opened 11 new stores in France" says the company's web site. So these cards are from the early 1900s. Although not a mailable postcard, these are postcard size: about 3.5 by 5.5 inches. Overall in fine antique condition.
If you love trivia and history, a French professor at the University of Utah has written a most interesting account about the irony of the Marquise de Sévigné having a chocolate company named after her. You can read it on her blog Wonders & Marvels; it's the blog post entitled "The Chocolate Baby." Send me message and I'll email you the link, if you'd like.