Prices for vintage French posters can range from $1,000 to $20,000-$50,000 and more, "but there is still a good supply of posters available that are priced under $5,000, " Stocking said.

The poster, by the French war painter Lucien Jonas, lists the date of the event as Sunday, Jan. 21, 1917, and the location as the magnificent old Palais du Trocadero in Paris, now long gone ...