Constantine II, AE follis. Cyzicus. AD 325-326. 

CONSTANTINVS IVN NOB C, laureate, draped and cuirassed bust left.
PROVIDEN-TIAE CAESS, campgate, seven layers, two turrets,
star abvove, no doors. 

Mintmark SMK Epsilon dot.

RIC VII Cyzicus 37.

With permission of cngcoins.com, Jan. 2007.