Constantine I, AE silvered follis. AD 324-325. Cyzicus. 

Obv: CONSTAN-TINVS AVG, laureate head right. 
Rev: PROVIDEN-TIAE AVGG, campgate, seven layers, two beacons, 
star above, no doors. 

Mintmark SMK epsilon.

RIC VII Cyzicus 24; Sear 16261. 
Very rare (RIC: R4).

With permission of TimeLine Auctions (www.timelineauctions.com), January, 2015