Aurelian AE Antoninianus. Siscia mint. 

Obv: IMP C AVRELIANVS AVG, radiate draped (or radiate
cuirassed) bust right 
Rev: CONCORDIA MILI, Two Concordia's holding standards with a third standard between them.
officina letter P, Q, S or T in ex. 

RIC 199
 
21mm, 2.76 gr.

Courtesy of tomross.ancients.info/
July 2009