Constantine  I Magnus (307-337 A.D.) -  Silvered AE3 - 18.07mm, 2.67gr
Obverse - CONSTANTINVS AVG
Constantine, his laureate head right.
Reverse - PROVIDENTIAE AVGG,
Campgate with six rows, two turrets,  no doors,
star above, top and bottom row blocks.
STRE in Exergue
Minted at the 2nd officina (S) in Treveri (Trier, Germany) in 327 or 328 A.D.

Reference:
Bruun, P.M., "Roman Imperial Coinage", Volume 7 (RIC), Trier, p212, nr 504, obverse 1(B1)
Failmezger, V., "Roman Bronze Coins From Paganism To Christianity 294-364 A.D.", nr 352cCI
Carson, R.A.G., Hill, P.V., & Kent, J.P.C., "Late Roman Bronze Coinage",  Part I, p4, nr 38
Sear, D.R., "Roman Coins and their Values" (RCV 4th Revised Edition), p326, nr. 3878, variety with STRE mint mark.
Van Meter, D., "Handbook of Roman Imperial Coins", p292, nr 85

Quality: Fine+
Rarity: C3