1956
National Gallery of Art, 1600
National Gallery of Art, 1515
National Gallery of Art, 1997
National Gallery of Art, 1472
National Gallery of Art, 1936
National Gallery of Art, 1972
National Gallery of Art, 1964
Frank, Robert, 1955
National Gallery of Art, 1772
National Gallery of Art, 1966
National Gallery of Art, 1641
![Ercole I d'Este, 1431-1505, Duke of Ferrara, Modena, and Reggio 1471 [obverse]](https://api.nga.gov/iiif/e36de80b-e494-4c81-adfd-dfaef8b04dbb/full/843,/0/default.jpg)
![Zone [trial proof 2]](https://api.nga.gov/iiif/b55fc1e7-9393-464d-882d-5849802c27d8/full/843,/0/default.jpg)
