- William Grimaldi (1751 - 1830)
- After Enoch Seeman (1694 - 1744)
- John, Duke of Marlborough, after Enoch Seeman
- Enamel on copper
- Image size: 127 x 10.8 cm
Frame size: 27.8 x 25.5 cm
- Signature: 'John Duke of Marlborough / By Wm. Grimaldi. / 1806'
Inscription: 'His Grace the first / Duke of Marlborough / Painted on Enamel by W. Grimaldi / Enamel painter to His royal Highness / the Prince of Wales. / and their / Royal Highnesses the Duke and Duchess of York. / No. 2 Albermarle Street'
- Reserve Gallery