Sperandio, ‘Ercole I d'Este, 1431-1505, Duke of Ferrara, and Eleonora of Aragon, 1450-1493, His Wife 1473 [obverse]’, probably 1473, National Gallery of Art, Washington, D.C.
overall (diameter): 11.2 cm (4 7/16 in.) gross weight: 367 gr