Cite

[Seal with letter "R"] [art original].

MLA

Harding, G. P. (George Perfect), 1780-1853, artist. [Seal with letter "R"] [art original].. [not after 1824]. https://collections.library.yale.edu/catalog/16193509.

APA, 6th edition

Harding, G. P. (George Perfect), 1780-1853, artist. ([not after 1824])[[Seal with letter "R"] [art original].]. https://collections.library.yale.edu/catalog/16193509.