1644
National Gallery of Art, 1983
National Gallery of Art, 1918
National Gallery of Art, 1961
National Gallery of Art, 1870
National Gallery of Art, 1959
National Gallery of Art, 1927
National Gallery of Art, 1600
National Gallery of Art, 1549
National Gallery of Art, 1940
National Gallery of Art, 1973
National Gallery of Art, 1809
National Gallery of Art, 1935
![Study of Heads [recto]](https://api.nga.gov/iiif/19aaeef8-aa3b-4fff-9a5d-623837998811/full/843,/0/default.jpg)
![Unicorn Purifying the Realm [reverse]](https://api.nga.gov/iiif/dc185499-f054-4eb6-9822-0039addcd993/full/843,/0/default.jpg)
