Lady Philadelphia Wharton after Van Dyck. Marked: Van Dyke (sic) Pinxrt; Published Jan 1st 1781, by John Boydell, engraver in Cheapside London; Robt Dunkarton Sculp."
Publisher: John Boydell (1719-1804) was a very successful London publisher, specializing in prints of old master paintings.
Engraver: Robert Dunkarton; British (1744-c. 1817).Unframed.