Nardo di Cione, ‘Madonna and Child with Saint Peter and Saint John the Evangelist [right panel]’, probably c. 1360, National Gallery of Art, Washington, D.C.
right panel: 49.1 x 16.2 cm (19 5/16 x 6 3/8 in.)  overall (entire triptych): 76 x 66.4 cm (29 15/16 x 26 1/8 in.)