Alexander Of Carthage. AE follis, AD 308-311. Carthage mint. 
23mm, 4.42 g.

IMP ALEXANDER P F AVG, laureate head right.
S P Q R OPTIMO PRINCIPI, aquila between two vexilla.

Mintmark PK. 

RIC VI Carthage 72; Cohen 12; Sear 15088.

With permission of cngcoins.com, auction 97, Lot 721, Sept. 2014.
Ex Roma Numismatics auction 7, Lot 1267, March 2014.