Watch List notes:

Diadumenian. As Caesar, AD 217-218. AR Denarius (18.8mm, 3.92 g, 6h). Rome mint. 2nd emission of Macrinus, AD 217-218. Bareheaded, draped, and cuirassed bust right / Diadumenian standing left, holding signum and scepter; two signa to right. RIC IV 102 (Macrinus); Clay Issue 2; RSC 3c. VF, toned, weakly struck on the reverse.

From the WRG Collection, purchased from William B. Porter, 1982.