Nikopolis ad Istrum in Moesia Inferior, 218 AD., Diadumenianus Caesar, Assarion, Pick 1884.

Nikopolis ad Istrum in Moesia Inferior, Diadumenian, 217-218 AD.,
Assarion / Æ18 (18-20 mm / 3,53 g),
Obv.: KM OΠΠEΛ - ANTΩNINOC , bare head of Diadumenian right, seen from behind.
Rev.: NIKOΛI - TΩN ΠP / oC IC , serpent entwined staff (of Asklepios).
Pick (AMNG I), 475, 1884 (4spec. listed) ; Malcolm Megaw collection: http://www.diadumenian.com/nicopolis%20staff%20and%20serpent%20error%20legend.jpg .