Constantine II AE4. 

Obv: CONSTANTINVS IVN NOB C, laureate, draped & cuirassed bust left 
Rev: PROVIDEN-TIAE CAESS, campgate, 3 turrets, 7-8 layers, star above, no 
 doors, wreath left, B right
Mintmark: SMAL. 

RIC VII Alexandria 46, rated R3

Contributed by Dane for Joe Guerra, December, 2008.