Antoninus Pius AE Sestertius. 140-144 AD. 

ANTONINVS AVG PIVS P P TR P COS III, laureate head right.
SALVS AVG S-C, Salus standing left, holding sceptre and extending patera to serpent rising from altar. 

RIC 635a; Cohen 710

Offered by Gorny & Mosch, Auction 232, Sept. 2015.