Watch List notes:

Diadumenian. As Caesar, AD 217-218. AR Denarius (20mm, 3.20 g, 12h). Rome mint. 2nd emission, 2nd phase of Macrinus, early AD 218. Bareheaded, draped, and cuirassed bust right / Diadumenian standing facing, head right, holding signum and scepter; two signa to right. RIC IV 102; Szaivert 9-10; RSC 3b. Near EF, toned.