Giovanni Alberghetti I, ‘A Table Bell with Portrait of Lodovico Maria Sforza, 1451-1508, called Il Moro, 7th Duke of Milan 1494-1508’, possibly c. 1494/1499, National Gallery of Art, Washington, D.C.
overall (height x diameter): 15.2 x 9.9 cm (6 x 3 7/8 in.)