License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Honoré Daumier. Mr. PRUDHOMME: Long live the third class compartments..., from 'On the train,' published in Le Charivari, August 30, 1864, August 30, 1864. The Metropolitan Museum of Art.