Antoninus Pius, Caesar, Denarius. 138 AD. 3.52g, 17mm.

Obv: IMP T AEL CAES ANTONINVS, bare head right 
Rev: TRIB POT COS, Pietas standing left, hand raised over altar at feet. 

RIC 452a [hadrian], RSC 1062, BMC 1013.  

With permission of cngcoins.com, the AK collection.