Watch List notes:

Diadumenian. As Caesar, A.D. 217-218. AE "limes" denarius (19.5 mm, 2.92 g, 6 h). Rome mint. M OPEL ANT DIADVMENIAN CAES, bare-headed, draped and cuirassed bust right / PRINC IVVENTVTIS, Diadumenian standing left, head right, holding scepter and standard, two more standards to his right. cf. RIC 202b; cf. RSC 3a. Fine, black patina.