Constantine I AE17 follis. Antioch, AD 331 and 333-334. 

CONSTANTINVS AVG, laurel and square rosette-diademed head right.
PROVIDENTIAE AVGG, campgate with 11 layers, two turrets, 
no door, star above, dot in doorway.
Delta-E across fields.
Mintmark SMANT. 

RIC VII Antioch 79 var (headwear).
Note: the dot in the doorway could simply be a centering mark from the die.

With permission of Savoca Numismatik Blue Auction 6, Lot 1415, April 2018.