Very rare Helena's follis from the mint in Trevir, with the rarity R4 in the 'Roman Imperial Coinage' catalog.
Beautifully preserved specimen with a natural patina.
Roman Imperial
Helena Augusta (325-329, mother of Constantine), Follis 325-326, Treveri mint
Obverse: diademed, mantled bust right, wearing necklace
FL HELENA AVGVSTA
Reverse: Securitas standing left, lowering branch in right hand and raising hem of robe with left, PTR (crescent) in exerque
SECVRITAS REIPVBLICE
Diameter 19 mm, weight 3.17 g