Constantine II AE follis. Alexandria.

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

RIC VII Alexandria 46, rated R3

With permission of Roma Numismatics Ltd - E-Sale 74, Lot 1387, Aug. 2020.