Antoninus Pius AE Dupondius. 154-155 AD. 

Obv: ANTONINVS AVG PIVS P P TR P XVIII, radiate head right 
Rev: LIBERTAS COS IIII S-C, Libertas standing left, holding pileus and sceptre.  

RIC 933; BMC 1469.

With permission of Fritz Rudolf Künker GmbH, auction 193, Lot 729, Sept. 2011.