Roman Empire. Antoninus Pius, 138-161 AD. Dupondius. Rome Mint. 23-25mm. 12.23g.
 
Obv: ANTONINVS AVG PIVS P P TR P, radiate head to right. Rev: COS IIII, Salus standing holding spear and feeding snake, SC across fields.
 
Reference: RIC. 798.
 
A rich medium light brown patina.