Known but a pleasing type:
17mm 3.27g, reduced follis/nummus, Cyzicus mint, cca. 328-329.
CONSTAN - TINVS AVG; diademed head right, gazing upwards
PROVIDEN - TIAE AVGG; campgate with no door, 8 layers of brick, 2 turrets and star above.
SMKΓ·
cf. RIC VII Cyzicus 57