Severus II, AE follis, Aquileia. 

IMP C SEVERVS PF AVG, laureate, helmeted, cuirassed bust left, 
holding spear and shield.
FIDES MILITVM AVGG ET CAESS NN, Fides standing facing, head
left, holding two standards.

Mintmark AQS

RIC VI Aquileia 77b

Used with permission of CNG (cngcoins.com)