1966
National Gallery of Art, 1933
National Gallery of Art, 1950
National Gallery of Art, 1943
National Gallery of Art, 1857
National Gallery of Art, 1515
National Gallery of Art, 1892
National Gallery of Art, 1600
National Gallery of Art, 1966
National Gallery of Art, 1500
National Gallery of Art, 1638
National Gallery of Art, 1833
National Gallery of Art, 1936
![Study of Heads [recto]](https://api.nga.gov/iiif/19aaeef8-aa3b-4fff-9a5d-623837998811/full/843,/0/default.jpg)
![Giangaleazzo Maria Sforza, 1469-1494, 6th Duke of Milan 1476 [obverse]](https://api.nga.gov/iiif/4f972cf3-1fd0-4694-a10f-95fce54bbf38/full/843,/0/default.jpg)
