Watch List notes:

EMPIRE, Diadumenian, as Caesar (217-218 AD), AR Denarius (217-218 AD) (Rome) (4.18g). Bareheaded, draped, and cuirassed bust right M OPEL ANT DIADVMENIANVS CAES Rev. Diadumenian standing left in military dress, head right, holding signum and scepter; two signa to right PRINC IVVENTVTIS. RIC 102, Cohen 3. Extemely Fine. Privately acquired from Tradart