Gallienus AE Antoninianus AD 253-268, Sole reign. Cyzicus. 24mm.

Obv: GALLIENVS AVG, radiate, draped bust right.
Rev: SALVS AVG, Salus standing right, feeding serpent in arms.
Mintmark: SPQR.

RIC V-i, 657; Goebl 1547Bc; RSC 932g; Sear -.

With permission of cngcoins.com, auction 319, lot 540. 
Sold for $65.