License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Anonymous. Vessel with grotesque masks, griffins, and a frieze populated by a bull and men in bas-relief, reverse copy after Cherubino Alberti, in turn after Polidoro da Caravaggio, ca. 1550–1600. The Metropolitan Museum of Art.