lower left in plate: Drawn by Mortimer; lower right in plate: Etch'd by R Blyth; lower center in plate: To Sir William Forbes Bar.t / This plate is gratefully Inscribed by His much obliged, and most obedient Servant, / From an original Drawing of Mortimer in the Collection of Richard Payne Knight Esq.r / London published as the Art dircts Nov.r 1782 by R. Blyth No. 105 New Bond Street
Donald Vogler, Portland, OR; gift to NGA, 2017.
- Sunderland, John. "John Hamilton Mortimer: His Life and Works," Walpole Society 52 (1986): no. 78a (undesc proof)