Alexander, AE follis, Carthage mint, AD 308-311. 

Obv: IMP ALEXANDER PF AVG, laureate head right.
Rev: ROMAE AETERNAE AVG N, Roma seated left on backless throne, 
holding globe and spear.

Mintmark P star K.

RIC VI Carthage 76; Sear 15087.
Rated R5.

with permission of cngcoins.com, Sept. 2008