Maximianus Herculius. AE half-follis. Trier. 307 AD. 

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

S-A across fields. 
Mintmark PTR. 

RIC VI Trier 738. Rare (R2).

With permission of Roma Numismatics, March, 2010