Watch List notes:

Diadumenian. As Caesar, A.D. 217-218. Æ sestertius (32.1 mm, 20.03 g, 6 h). Rome mint. Rare. M OPEL ANTONINVS DIADVMENIANVS CAES, bare-headed, draped and cuirassed bust right / PRINC IVVENTVTIS, S C, Diadumenian standing left, head right, holding standard, two more standards to his right. RIC 211; BMCRE 149. aVF, holed and filled.