Diadumenian, AR quinarius. Rome. AD 217-218. 15 mm, 3.62 g.

M OPEL ANT DIADVMENIAN CAES, bare-headed, draped bust right.
PRINC IVVENTVTIS, Diadumenian, standing front, looking right, holding standard and sceptre.

RIC 110 var (listed only as AV quinarius).
Image courtesy of Numismatica Genevensis SA auction 12, Lot 143, Nov. 2019.