*AAH* Constantine I "AE Campgate" 
Item number: 3035619712 

Constantine I  AD
306-337 AE3 
Obv: CONSTAN-TINVS AVG - Laureate head right 
Rev: PROVIDEN-TIAE AVGG - Campgate with two turrets and one star. 
Exe: BSIS double-crescent) 

Siscia mint: AD 328-329 = RIC VII, 214