The currency unit in France at this time was: Livre, Sols (12 sols = 1 Livre) and Dernier (20 Dernier = 1 Sol). My conclusion is that the writing on the back refers to the content of some item to which the playing card was attached (thus the pin marks) and the value of the item was written in Sols on the card.
Three of the cards have the term ‘appel de Gand’. The cards have the following values: 1 at 2 sols, 2 at 3 sols and 1 at 4 sols the fifth card states ‘fordre’ of the same series. Although they cannot be considered numismatic items, I think as monetary playing cards, they are extremely interesting.
For more information visit our web site, http://www.glabarre.com, or call George LaBarre at 1-800-717-9529.
George H. LaBarre Galleries - Collectible Stocks and Bonds