Constantine I, AE3, 328?, Constantina, Officina 2?

Constantine I, AE3, 328?, Constantina, Officina 2? CONSTAN_TINVS AVG Pearl-diademed head right, long diadem ties VIRTV_S AVGG Campgate with seven rows, four turrets, no doors, star above, top and bottom rows empty blocks S | F across fields S(?)CONST in exergue 18mm x 21mm, 3.26g RIC VII, -- Ex Keith Metzer Collection Note: Same as RIC 321, but missing open doors.