Trier, 18mm, 2.96g – Sear 17217, RIC 505

“CONSTANTINVS IVN NOB C, laureate, draped, cuirassed bust left.
PROVIDEN-TIAE CAESS, campgate, 6 layers, 2 turrets, star above, no doors.
Mintmark PTRE

RIC VII Trier 505, rated C3”