Watch List notes:

Diadumenian. As Caesar, AD 217-218. AR Denarius (20mm, 3.04 g, 6h). Rome mint. 2nd emission of Macrinus, AD 217-218. Bareheaded, draped, and cuirassed bust right / Diadumenian standing slightly left, head right, holding signum and scepter; two signa to right. RIC IV 102 (Macrinus); Clay Issue 2; RSC 3b. Toned, some encrustation. Good VF.

From the Dr. John Whitehead Collection, purchased from Forum Ancient Coins.