The same punch marks with the same sequential strikes were found on two statues by Benvenuto Cellini (Italian, 1500–1571). The right image from the forehead of the Bust of Bindo Altoviti, 1546–50, H. 105.5 cm (Isabella Stewart Gardner Museum, Boston, inv. S26e21) and the left and middle images from Medusa’s neck on Perseus with the Head of Medusa, 1545–54, H. 320 cm (bronze group) (Loggia dei Lanzi, Piazza della Signoria, Florence). Micro-hardness tests were undertaken using a calibrated prism penetration durimeter, showing values very similar to that of a cold-worked copper surface. See I.6, note 17; Morigi, Giovanni, and Lorenzo Morigi. 2004. “Il bronzo di Benvenuto Cellini a Boston. Il restauro del busto di Bindo Altoviti.” Kermes 53:20–24..