Signed and dated, in plate, below image, lower right: J. Houbraken sculps. Amst. 1745.
Inscribed, in plate, around top half of portrait medallion: JOHN DUKE OF MARLBOROUGH. Inscribed, below image, lower left: G. Kneller pinxit. Inscribed, lower center: In the Collection of the Honble. John Spencer. Inscribed, lower right: Impensis I. & P. Knapton. Londini