Diadumenian as Caesar (217-218). AR Denarius. Rome mint, 217 AD. Obv. M OPEL ANT DIADVMENIAN CAES. Bare-headed, draped and cuirassed bust right. Rev. PRINC IVVENTVTIS. Diadumenian standing left, holding baton and sceptre; on right, two standards surmounted by eagle and wreath. RIC IV Macrinus 108. 2.94 g. 19.00 mm. R. Rare. Light tone. Nice example fully centred. Good VF.