Diadumenian, AE Sestertius. Rome. AD 217-218. 32 mm, 30.34 g. 

M OPEL ANTONINVS DIADVMENIANVS CAES, bare-headed, draped, cuirassed bust right.
PRINC IVVENTVTIS, Diadumenian, standing front, looking right, holding baton and sceptre, two standards to right. SC below. 

RIC 214; Cohen 15; BMCRE 149 note.

With permission of cngcoins.com, auction 108, Lot 210, Feb 2005.