Diadumenian as Caesar (217-218). AE As, Rome mint. D/ M OPEL ANTONINVS DIADUMENIANVS CAES. Bare headed and draped bust right. R/ PRINC IVVENTVTIS[SC]. Diadumenian standing facing, head right, holding aquila and sceptre; aquila and signum to right. RIC 212; C. 9. AE. g. 10.29 mm. 26.00 R. Rare. Superb portrait. Green brown patina. VF/Good VF.