Watch List notes:

Diadumenian. As Caesar, AD 217-218. Æ Sestertius (31mm, 23.86 g, 6h). Rome mint. 2nd emission of Macrinus, AD 217-218. Bareheaded, draped, and cuirassed bust right / Diadumenian standing facing, head right, holding aquila and scepter; aquila and signum to right. RIC IV 211; Clay Issue 2; Banti 4. Brown patina, porosity. Fine.