Maximian Herculius. AE Follis. Trier. 307-308 AD. 

IMP CM AVREL VAL MAXIMIANVS PF AVG, laureate, cuirassed bust right
GENIO-POP ROM, Genius standing left, tower on head, loins 
draped, holding patera and cornucopiae. 

S-A across fields. 

Mintmark PTR. 

RIC VI Trier 766.

Courtesy of Roma Numismatics, May, 2010