Antoninus Pius. AD 138-161. AR denarius. Rome, struck AD 155-156. 

ANTONINVS AVG PIVS P P IMP II, laureate head right.
TR POT XIX COS IIII, Salus seated left by altar, holding patera, feeding a serpent arising from altar before her. 

RIC 254; BMC 859; RSC 982.

With permission of Auktionshaus H. D. Rauch GmbH auction 101, Lot 1585, April 2016.