This coin is not listed in RIC for I workshop for Antioch 75. This workshop is listed later for RIC 82 (second picture below)
Bruun sorted the Helena types by diadem styles. The early issue (RIC 75) has a pearl diadem; while the later issue (RIC 82) has a diadem with squares or ladder shaped.
Helena
A.D. 328- 329
19x20mm 2.6gm
FL HELENA AVGVSTA; pearl-diademed and draped bust right.
SECVRITAS REIPVBLICE; Securitas standing left, lowering branch, raising robe with right hand; B in left field.
In ex. •SMANTI
RIC VII Antioch 75
