1887
National Gallery of Art, 1918
National Gallery of Art, 1964
National Gallery of Art, 1500
National Gallery of Art, 1938
National Gallery of Art, 1993
National Gallery of Art, 1986
National Gallery of Art, 1936
National Gallery of Art, 1968
National Gallery of Art, 1962
National Gallery of Art, 1929
National Gallery of Art, 1947
![Giangaleazzo Maria Sforza, 1469-1494, 6th Duke of Milan 1476 [obverse]](https://api.nga.gov/iiif/da01db2f-21b2-48a9-adc6-9dd7a44f7e22/full/843,/0/default.jpg)
![Letter to the Mother [right]](https://api.nga.gov/iiif/58c1a613-3c74-46c7-bfdf-949fb99ff1a2/full/843,/0/default.jpg)
![Figure 7 [trial proof]](https://api.nga.gov/iiif/f3771b79-765f-4336-addb-4c11704fc68d/full/843,/0/default.jpg)
