Constantine I, AE Follis. 307-308 AD. Trier. 

IMP CONSTANTINVS 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 770

Contributed by Glenn Simonelli, Feb. 2014