Constantius I, AE follis, Trier. after AD 299.

CONSTANTIVS NOB CAES, laureate, draped, cuirassed bust 
right, seen from the back.
GENIO POPV-LI ROMANI, Genius standing left, modius on head, 
naked except for chlamys over left shoulder, holding patera 
and cornucopiae.
Left field: A
Right field: star.
Mintmark: R (instead of TR)

RIC VI Trier 359a unlisted var (emperor and mintmark, T missing)

Contributed by "Aulus Allienus", of the Forvm Ancient Coins, Dec. 2013.