Group of Five Male Figures in Half-length, 1640?50, Pen and brown ink, over black chalk; glued onto secondary paper support, 2 1/4 x 4 3/8in. (5. 7 x 11. 1cm), Drawings, Stefano della Bella (Italian, Florence 1610?1664 Florence), This drawing was previously considered anonymous, until an attribution to Stefano della Bella was proposed on the mount by Anna Maria Petrioli Tofani and Carmen C. Bambach. The drawing is datable to the 1640's, when della Bella was intending to draft his treatise on drawing, 'I principii del disegno