1976
National Gallery of Art, 1500
National Gallery of Art, 1937
National Gallery of Art, 1595
National Gallery of Art, 1989
National Gallery of Art, 1938
National Gallery of Art, 1824
National Gallery of Art, 1956
National Gallery of Art, 1935
National Gallery of Art, 1975
![#6 (after 'Untitled 1975') [progressive proof 4]](https://api.nga.gov/iiif/83811d43-0371-4a80-893c-14df34d5290f/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)
