License, verbatimPD
The National Gallery of Art: open access image with no usage restrictions under the NGA's open access policy (openaccess=1 in the Gallery's published_images dataset).
Zuanne I (Zanin) Alberghetti. Hand Bell with Portrait of Lodovico Maria Sforza, 1451-1508, called Il Moro, 7th Duke of Milan, and Figures of Hercules, possibly 1491/1497. National Gallery of Art, Washington.