Watch List notes:

Diadumenian as Caesar. 217-218 AD. Denarius, 3.23g (6h). Rome. Obv: M OPEL ANT DIADVMENIAN CAES Bare-headed, draped bust right, seen from front. Rx: PRINC IVVENTVTIS Diadumenian standing left, head right, holding standard and scepter, two further standards behind him. BM 87. RIC 102. Cohen 3 (15 Fr.). Mint State

Ex Helianthus annuus Collection. Ex Morton & Eden, 11 June 2014, lot 103. Ex M. Trenerry list, May 2009 (cover coin)