Constantine II AE follis. Siscia. AD 324-361

Obv: CONSTANTINVS IVN NOB C - Laureate head right. 
Rev: PROVIDEN-TIAE CAESS - Campgate with two turrets, no doors and a star above. 

Mintmark epsilon SIS-double-crescent
RIC VII, 216

With permission of Auktionshaus H. D. Rauch GmbH, Dec. 2015