Nardo di Cione, ‘Madonna and Child with Saint Peter and Saint John the Evangelist [middle panel]’, probably c. 1360, National Gallery of Art, Washington, D.C.
middle panel: 76.7 x 34.9 cm (30 3/16 x 13 3/4 in.)  overall (entire triptych): 76 x 66.4 cm (29 15/16 x 26 1/8 in.)