Helena. AE Follis. Trier. Engraver's errors and unlisted officina. 

FL AELENA-AVGVSTA (instead of ..HELENA), draped bust right wearing 
ornamental mantle and necklace, hair elaborately dressed
SECVRITAS-REIPVBLICA (instead of .. REIPVBLICE), Securitas standing 
left, holding branch and raising robe. 

Mintmark PTR dot (unlisted officina)

RIC VII Trier 481 var (obv + rev legends (engravers errors) 
and unlisted officina. 

Note The correctly engraved version from officina S is rated R5 
and this is an extremely rare variety of that.

With permission of Roma Numismatics, October, 2009