Helena, mother of Constantine I, first wife of Constantius I  (born ca. 248 A.D. - died 330 A.D.) -  AE3 - 17.85mm, 2.92g
Obverse - FL HELENA AVGVSTA Helena, her pearl-diademed and mantled bust right, wearing necklace.	Reverse - SECURITAS REIPVBLICE SMKA dot in Exergue Securitas (or Helena) standing left, lowering branch, raising robe with right hand.
Minted at the 1st officina in Cyzicus (Balkiz, Turkey) between 325 and 326 A.D. Reference: Bruun, P.M., "Roman Imperial Coinage", Volume 7 (RIC), Cyzicus, p649, nr 39, obverse legend 12, bust E10 Failmezger, V., "Roman Bronze Coins From Paganism To Christianity 294-364 A.D." (Fm), nr 357H Carson, R.A.G., Hill, P.V., & Kent, J.P.C., "Late Roman Bronze Coinage" (LRBC),  Part I, p28, nr 1194 Sear, D.R., "Roman Coins and their Values" (Sear RCV 4th Revised Ed.), p329, nr. 3908, var with SMKA dot mint mark. Sear, D.R., "Roman Coins and their Values" (Sear RCV Millennium Ed.), Volume 4, p516, nr 16624.  Suarez, R., "Encyclopedia of Roman Imperial Coins II" (ERIC2),  p887, nr.47 (B1, O1, R3, T3, M5, SMKAdot) Suarez, R., "Encyclopedia of Roman Imperial Coins II" (ERIC II-digital), p733, nr.47 (B1, O1, R3, T3, M5, SMKAdot) Van Meter, D., "Handbook of Roman Imperial Coins" (VM), p293, nr 3, reverse legend variety Kampmann, U., "Die Münzen der römischen Kaiserzeit" (K, 2e Auflage), p426, nr. 139.4. Quality: Very Fine Rarity:  C (Common)