Helena. AE follis of Trier. 327-328.

FL HELENA-AVGVSTA, mantled, diademed bust right with necklace.
SECVRITAS-REIPVBLICE, Securitas standing left, lowering 
branch with left hand, raising hem of robe with right hand

Mintmark dot PTRE.
RIC VII Trier 515; Sear 16594.
Rare, rated R2.