Constantine II, AE follis, Siscia. 19mm. AD 321-324 AD.

CONSTANTINVS IVN NOB C, laureate head right.
CAESARVM NOSTRORVM around VOT X within wreath. 

Mintmark Epsilon SIS dot-in-crescent.

RIC VII Siscia 170 var (mintmark). Rated extremely rare, R4.

Contributed by Carpe Diem Numismatics, June 2017.