Unsure of validity of this item.  Marked etching portrait that is listed as Leonardo Di Vinci, by engraver Francesco Bartolozzi  and after Annibale Carracci.   I am not sure this is all valid.  I could not verify,  Found all sorts of possibilies fo subject .. maybe Julio Romano-FirtiGiulio Romano (Giulio Pippi)Romano, Giulio (Giovanni Francesco Penni)?  Mystery piece for sure!