Nikopolis ad Istrum in Moesia Inferior, 218 AD., Diadumenianus Caesar, 4 Assaria, Pick 1797.

Nikopolis ad Istrum in Moesia Inferior, Diadumenianus Caesar, issued under Legate Agrippa, 218 AD.,
Tetrassarion / Æ 27 (26-27 mm / 10,80 g),
Obv.: K M OΠΠE[Λ AN]TΩNI ΔIAΔOYMENIAN-[OC] , bare head of Diadumenian right, seen from behind.
Rev.: VΠ AΓPIΠΠA NIK - [OΠOΛITΩN ΠPO] / C ICTPΩ , Artemis Huntress advancing right, holding bow and taking arrow from quiver at her back, hound running r. at her feet.
Pick (AMNG I), 458, 1797 (3 pieces listed) ; Moushmov type no. 1302 .
http://www.diadumenian.com/Die%20tables%20nicopolis%204%20assaria.html obverse die 22 / Artemis reverse shared with Macrinus obv.
same dies on http://www.diadumenian.com/Nicopolis%20artemis%20brass.html