Hadrian, Rome, AE dupondius, 

IMP CAESAR TRAIANVS HADRIANVS AVG, radiate heroic bust right
PONT MAX TR POT COS II SC SALVS AVG, Salus seated left, feeding serpent arising from altar, SALVS AVG below, 

Ref: RIC II 553 var (not listed as dupondius)

Contributed by David Ledford, July 2009