upper left in plate: AEtatis; upper right in plate: Suae 28; lower left in plate: G. Kneller SR Imp. et Agnl. Eques Aur. pinx.; lower right in plate: I. Smith fe. 1703; lower center in plate: John Earl of Mar Lord Erskine Garioch & Alloa, Heritable Governeur & Captain of Stirling Castle / one of the Lords of Her Majesty's Privy Council and Exchequer, and Colonel of a Regiment of Foot.
Christopher Lennox-Boyd; (Nicholas Stogdon, Oxford); purchased 2001 by NGA.
- Smith, John Chaloner. British mezzotinto portraits, being a descriptive catalogue of these engravings from the introduction of the art to the early part of the present century. 4 vols. London: Henry Sotheran and Co., 1884.