Watch List notes:

Diadumenian, as Caesar, 217-218. Denarius (Silver, 19.5 mm, 2.97 g, 6 h), Rome, late July 217 - end February 218. M OPEL ANT DIADVMENIAN CAES Bare-headed and draped bust of Diadumenian to right. Rev. PRINC IVVENTVTIS Diadumenian standing facing, his head turned to right, holding standard with his right hand and scepter in his left; to right, two standards. BMC 87. Cohen 3. RIC 102. Struck somewhat softly on the reverse, otherwise, good very fine.
From an American collection.