Roman Empire, Carinus, Antoninian

A common example of this issue.

Obverse: a bust of the emperor wearing a radiate crown and armor, facing right; the legend around the rim reads:
IMP CARINVS P F AVG;

Reverse: Fides standing to the left, holding two banners; the legend around the edge reads:
FIDES MILITVM, with a crescent moon in the KA section;