Watch List notes:

Diadumenian, as Caesar (Macrinus, 217-218), As, Rome, AD 217-218; AE (g 8,68; mm 26; h 7); M OPEL ANTONINVS DIADVMENIANVS CAES, bust draped and cuirassed, Rv. PRINC IVVENTVTIS, Diadumenian standing l., head r., holding sceptre and standard; on r., two standards; in field, S - C. RIC 212; C 8.
Rare. Good portrait, dark patina and large flan: extremely fine.