Carte à jouer érotique à secret - Valet de pique

Secret erotic playing cards - Jack of Spades
[France] s.d(circa 1860), 5.5 x 8.6 cm, one playing card
Secret erotic playing card, unknown manufacturer, produced in France around the 1860s. Lithograph coloured by stencil, white verso.
In the light, the transparent card reveals an erotic scene: a lady is sitting underneath the valet and is caressing him.
A curiosity!