Nikopolis ad Istrum in Moesia Inferior, 218 AD., Diadumenianus Caesar, Assarion, Pick 1890.

Nikopolis ad Istrum in Moesia Inferior, Diadumenian, 217-218 AD.,
Assarion / Æ17 (15-18 mm / 3,02 g),
Obv.: K M OΠΠEΛ - ANTΩNINOC , bare head of Diadumenian facing right.
Rev.: NIKO / ΠOΛI / TΩN ΠP / C ICTP , legend in 4 lines within dotted circle.
Pick (AMNG I), 476, 1890 (1 piece listed, St. Petersburg) ; Moushmov 1343 ; http://www.diadumenian.com/Diadumenian%20-%20nicopolis%20ad%20istrum%20pennies%20-%20die%20sheet%20table.pdf - no. 6 (for the obverse die) ; Hristova/Jekov (Bulg ed. 2009), p. 373, no. 8.25.54.7. var. (wrong legend) (R2) .