Inscription: Annotated on verso, "0.50" in pen and brown ink (possibly Lugt 2963 or 2984, as example of Richardson Sr.'s inventory number.
"Michelangelo" on mat, in pen and brown ink (possibly Lugt 2995 or 2996, as writing of Richardson, Sr.)
"g" [as capital letter] in pen and black ink at bottom right corner.
Also, several numbers on verso in pencil.
Jonathan Richardson Sr. (British, London 1667–1745 London)?; Thomas Banks (British, Lambeth baptised 1738–1805 London); Sir Edward John Poynter (British (born France), Paris 1836–1919 London)