Watch List notes:

Diadumenian. As Caesar, AD 217-218. Æ As (27mm, 10.57 g, 1h). Rome mint. 2nd emission of Macrinus, late summer AD 217-spring AD 218. Bareheaded, draped, and cuirassed bust right / Diadumenian standing left, head right, holding aquila and scepter; two signa to right. RIC IV 212; Szaivert series 9. Fine, green patina, deposits. Very rare with ANT rather than ANTONINVS in obverse legend.

From the R. D. Frederick Collection.