Malter - Diadumenian AE-28. Choice Portrait! $106.50 Oct-31-00 Roman Provinces, Diadumenian 217 - 218 AD. AE-28 of Nicopolis ad Istrum, Moesia Inferior. 12.63g. His bareheaded and draped bust rt. / Hygeia standing lt., feeding a serpent she holds in her arms. Nice VF with an outstanding portrait of this young son of the emperor Macrinus.