Septimius Severus, AE18, Nikopolis ad Istrum.

AV KAI CE CEVHRO, laureate head right.
NIKOPOLI PROC ICTR, Crescent and one star.

Varbanov 2335

Note: Varbanov lists 17 different entries for the 
crescent and one star types, depending on obverse
and reverse legends, and size.