Drawings of comparable technique are in the Pierpont Morgan Library and the Uffizi, M. Newcome Schleier, Disegni Genovesi dal XVI al XVIII Secolo, exhib. cat., Uffizi, Florence, 1989, no. 10, fig. 10; another was sold in these Rooms, 6 July 1993, lot 39, illustrated.
The attribution was, on the basis of a photograph, kindly confirmed by Mary Newcome Schleier.