Marcus Aurelius, AE As, Rome mint. 175-176 AD. 

M ANTONINVS AVG GERM SARM, laureate head right.
SECVRITAS PVB TR P XXX IMP VIII COS III, SC, Securitas 
seated left on throne, her right hand to her head and
resting her left arm on the throne's arm. 

RIC 1166; Cohen 589. 

Courtesy of the Hunterian Museum & Art Gallery collections, 
cat. no. GLAHM 27528