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Aurelian, AE Antoninianus, AD 270-275, Cyzicus. 23mm, 4.03g 

IMP AVRELIANVS AVG, Radiate, cuirassed bust right 
RESTITVTOR EXERCITI, Mars, helmeted, standing right, holding spear, presenting globe to emperor standing left, holding sceptre.

D in lower centre
Mintmark XXI

RIC V-1, 366 Cyzicus; Sear 11597