Diocletian, Trier, AE follis

IMP DIOCLETIANVS AVG, Laureate, cuirassed bust right.
GENIO POPV-LI ROMANI, Genius, turreted, standing left, 
holding out phiale in right hand in front, cornucopia 
in left arm, S-F across fields, mintmark PTR in ex.

Ref: RIC VI Trier 582a

With permission of Roma Numismatics, August, 2009