Constantine II AE3, 

FL IVL CONSTANTIVS NOB C, laureate, draped, cuirassed 
bust right
PROVIDEN-TIAE CAESS, campgate, 2 turrets, 7 layers, 
dots in top layer, star above, no doors. 

Mintmark: SMTSB. 

RIC VII Thessalonica 158, rated C3

Contributed by Dane for George Clegg (biggyg2), June 2009.