Porcelio de' Pandoni's De sestertio et talento is a work of extraordinary interest for the history of Humanistic and Renaissance antiquarianism. This short work was written in the middle of the fifteenth century, and it throws new light on a little-known aspect of the vast and varied humanist learning. Moreover, to the best of our knowledge, it is the first treatise ever written about numismatics. Although its origins are not entirely clear, it was completed in Milan. In a prefatory letter, in fact, Pandoni offers the work to the powerful secretary of Francesco Sforza, Cicco Simonetta. In fact, as Andrew Burnett speculates, it is possible that the letter of dedication contains statements that are only partially accurate and that the treat...