License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Honoré Daumier. L'astronome allemand lâchant un fameux canard, from La Comète de 1857, published in Le Charivari, March 17, 1857, January 13, 1858. The Metropolitan Museum of Art.