Watch List notes:

Diadumenian. As Caesar, AD 217-218. AR Antoninianus (22.5mm, 5.24 g, 12h). Rome mint. 2nd emission, 2nd phase of Macrinus, early AD 218. Radiate, draped, and cuirassed bust right / Diadumenian standing left, holding baton and scepter; two signa to right. RIC IV 106; Szaivert series 9-10; RSC 11. Near EF, lightly toned, tiny flaw on neck. Rare.