Marcus Aurelius. 161-180 AD. AE Sestertius, 169-170 AD. 

IMP M ANTONINVS AVG TR P XXIIII, laureate head right
SALVTI AVG COS III, S C across fields, Salus standing left, 
holding sceptre and feeding serpent entwined around altar.

RIC 979.

With permission of cngcoins.com, 2005.