This postcard with a playing card motif depicts Charles-Ferdinand Walsin-Esterhazy (1847–1923) as the jack of spades, dressed in black and wearing a mask, hat and cloak. It is captioned "Valet de Pique – Trahison" ("jack of spades – treason").
Valet de Pique: Trahison, playing card, colour print, 14 x 9 cm, 1901, illustration: Gaston Noury (1865–1936); source: Bibliothèque historique de la Ville de Paris, https://bibliotheques-specialisees.paris.fr/ark:/73873/pf0001017118/0007/v0001.simple.selectedTab=record, public domain.