Diadumenian, as Caesar. Sestertius struck under his father Macrinus. Rome. AD 217 (Bronze, 32.36 x 39.47 mm, 26.90 g). M OPEL DIADVMENIANVS CAES, bare-headed and draped bust right. Rev. [PRINC IVVENTVTIS / S C] , Diadumenian standing left, holding baton and sceptre; aquila and signa to right. RIC IV 215. Cohen 13. BMCRE 149. An interesting specimen, nailed to a bronze plate, as if it had been repurposed as a stud or phalera. Untouched green patina. Fine.