Marcus Aurelius. AE As. Rome. AD 172-173. 27 mm, 12.85 g. 

M ANTONINVS AVG TR P XXVII, laureate, draped and cuirassed bust right.
SECVRITAS PVBLICA IMP VI COS III, S-C across fields, Securitas standing right, crowning herself with a wreath and holding a long palm branch in left hand.

RIC 1085.

Image courtesy of the ANS, New York. Inv. no. 1954.18.169.