1971
National Gallery of Art, 1580
National Gallery of Art, 1940
National Gallery of Art, 1530
National Gallery of Art, 1915
National Gallery of Art, 1968
National Gallery of Art, 1936
National Gallery of Art, 1973
National Gallery of Art, 1992
National Gallery of Art, 1969
National Gallery of Art, 1922
National Gallery of Art, 1456
![Untitled [verso]](https://api.nga.gov/iiif/241da734-c8c4-4f8f-a104-df63cc4e1be1/full/843,/0/default.jpg)
![Figure 5 [trial proof 1]](https://api.nga.gov/iiif/11a9dbc3-57c4-4067-a0dc-a96f5f5f4375/full/843,/0/default.jpg)
![Francesco I Sforza, 1401-1466, 4th Duke of Milan 1450 [obverse]](https://api.nga.gov/iiif/f25ed8ee-67a1-4e33-b136-160f6e2484e1/full/843,/0/default.jpg)