Maximian Herculius AE Follis. 303-305 AD. Trier. 

Obv: IMP MAXIMIANVS AVG, laureate, draped, cuirassed bust right
Rev: GENIO POPV-LI ROMANI, Genius standing left, modius on head, naked except for chlamys over left shoulder, holding patera and cornucopiae.

S-F across fields.
Mintmark PTR. 

RIC VI Trier 583b.

With permission of Roma Numismatics, June 2009