License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
James Gillray. British Tars Towing the Danish Fleet into Harbour; the Broad-Bottom Leviathan trying Billy's Old Boat, and the Little Corsican tottering on the Clouds of Ambition, October 1, 1807. The Metropolitan Museum of Art.