Marcus Aurelius. AE As. Rome. AD 172-173. 25 mm, 11.4 g. 

M ANTONINVS AVG TR P XXVII, laureate, cuirassed bust right.
SECVRITAS PVBLICA IMP VI COS III, S-C across fields, Securitas standing right, holding wreath and long palm branch.

RIC 1088.

Image courtesy of the Universität Trier. Inv. no. ID40.