July 14, 1880 was the first celebration of Bastille day, the victory of the French revolution. I'm guessing, but I would give good odds that the lady on that plaque is a portrait of Marie Antoinette, Queen of France as she captures the luxurious lifestyle of the French royalty pre Revolution. She was the last Queen of France.
I have no clue as to the age of that nor if it is original or newly manufactured.