On the reverse of the engraving and etching “Silence” by French engraver Laurent Cars (1699-1771) after the painting by Jean-Baptiste Greuze (1725-1805), a handwritten inscription was found. The only thing I found out so far was that it is in French, and that it starts with “Cette epreuve…” (“This proof…”). If anybody is able to provide a transcription, I would very appreciate it.
Click on the picture below too see a full-sized version of the inscription.
Laurent Cars after Jean-Baptise Greuze: Silence!