Unused sepia card captioned (on the reverse) “Service des Sites de la Guerre 1914-1918 … Vende au profit des Oeuvres des Invalides et Orphelins de la Guerre”.  We believe your French is good enough to know what that means, and who the cards were for.  Two opposing perforated edges mean this and similar cards from Ypres were originally part of a linked set.  Grade: 1