Constantine  II (337-340 A.D.) -  AE3 - 18.16mm, 2.50gr
Obverse - CONSTANTINVS IVN NOB C
Constantine II, his laureate, draped and cuirassed bust right.
Reverse - PROVIDENTIAE CAESS,
Campgate with eight rows, two turrets,  no doors, star above.
SMH Gamma in Exergue
Minted at the 3rd officina in Heraclea (Marmara Ereglisi, Turkey) in 325 or 326 A.D., as Caesar under Constantine I
Reference:
Bruun, P.M., "Roman Imperial Coinage", Volume 7 (RIC), Heraclea, p551, nr 77, obverse legend 7, bust B4.
Sear, David R., "Roman Coins and their Values" (RCV 4th Revised Edition), p332, nr. 3948, variety
Failmezger, V., "Roman Bronze Coins From Paganism To Christianity 294-364 A.D.", nr 354jCII
Carson, R.A.G., Hill, P.V., & Kent, J.P.C., "Late Roman Bronze Coinage",  Part I, p22, .nr 871
Van Meter, David, "Handbook of Roman Imperial Coins", p295, nr 38, variety with head right
Quality: Fine