138 NGC XF Caesar Antoninus Pius Roman Empire Denarius Rare Concordia (19063005C)Extremely Fine Roman Empire silver denarius coin. Rare type struck for Caesar Antoninus Pius at the Rome Mint during the reign of his adoptive father Emperor Hadrian. Caesar was used by emperors to designate their heirs, who would later adopt the title of Augustus when they became emperor. The title originated from the cognomen of Julius Caesar. Dated TRIB POT COS = Feb 25th to July 10, 138 CE. RIC H450, 3. 4g. Certified by NGC to XF. Obverse: IMP T