Buenas.
Yo de momento propongo algo parecida a esta -la estrella cambia un poco-(ver leyenda reverso):
Coin Type: Bronze assarion of Caracalla, Caesar Dec 195 - 28 Jan 198 CE, Augustus 28 Jan 198 - 8 Apr 217 CE.
Mint and Date: Nikopolis ad Istrum in Lower Moesia, 195-198 CE
Size and Weight: 16mm x 17mm, 3.09g
Obverse: M AYP KAIC ANTΩNEINO
Bare head right.
Reverse: NIKOΠOΛITΩN ΠPOC ICTPO
Star in crescent moon.
Provenance: del550 (eBay), October 2008
Ref: Moushmov 1118; Varbanov I (English) —
BW Ref: 048 039 133
http://www.forumancientcoins.com/moonmoth/coins/caracalla_048.html
Ya te diran mejor.
Saludos.