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Aurelian AE Antoninianus. Siscia, AD 272-274. 

IMP AVRELIANVS AVG, radiate, cuirassed bust right, holding caduceus over shoulder and shield on right arm.
IOVI CONSERVATORI, emperor standing right, holding short sceptre, receiving globe from Jupiter, standing left, holding sceptre. 

Mintmark star S. 

RIC V-1, 227 Siscia var (bust type).