Andrea del Verrocchio (Italian, ca. 1435-1488) and Attributed to Leonardo da Vinci (1452-1519). Beheading of St. John the Baptist from the Silver Altar of the Baptistery (1477-83). Silver. 31.5 x 42 cm (12 3/8 x 16 1/2 in.). Museo dell'Opera del Duomo, Florence.