Workshop of Simone Martini, ‘Saint Matthew’, probably c. 1320, National Gallery of Art, Washington, D.C.
painted surface: 26.4 x 19.6 cm (10 3/8 x 7 11/16 in.)  overall: 30.8 x 23.2 cm (12 1/8 x 9 1/8 in.)  framed: 44.4 x 60 cm (17 1/2 x 23 5/8 in.)