Constantine  I Magnus (307-337 A.D.) - AE3 - 18.25mm, 2.74gr
Obverse - CONSTAN-TINVS AVG
Constantine, his laureate head right.
Reverse - PROVIDEN-TIAE AVGG,
Campgate with nine rows, two turrets,  no doors, star above,
top and bottom row blocks.
dot Gamma SIS dot in Exergue.

Minted at the 3rd officina in Siskia (Sisak, Croatia) between 326 and 327 A.D.
Reference:
Bruun, P.M., "Roman Imperial Coinage", Volume 7 (RIC), Siskia, p449, nr 200, obverse 1-B1
Failmezger, V., "Roman Bronze Coins From Paganism To Christianity 294-364 A.D.", nr 352fCI
Carson, R.A.G., Hill, P.V., & Kent, J.P.C., "Late Roman Bronze Coinage",  Part I, p18, .nr 724
Sear, D.R., "Roman Coins and their Values" (RCV 4th Revised Edition), p326, nr. 3878, variety
Van Meter, D., "Handbook of Roman Imperial Coins", p292, nr 85
Quality: Fine