License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Stefano della Bella. Torso of a Man with a Shield and Eye Study, plate 19 from "Collection of various doodles and etching proofs" (Recueil de divers griffonnements et preuves d'eauforte), ca. 1646. The Metropolitan Museum of Art.