Crispus. AE Follis. 321-324 AD. Siscia. 

IVL CRIS-PVS NOB C, laureate head right

CAESARVM NOSTRORVM around VOT dot X within wreath.

Mintmark BSIS sunburst. 

RIC VII Siscia 181, rated C3

With permission of Roma Numismatics, Jan. 2010