ROMAN REPUBLIC, Q. Marcus Libo, as Triumvir Monetalis (moneyer), Silver Denarius (3.90g, 18mm), Rome mint 148 BC. Obv. Head of Roma right, wearing winged Attic helmet, "X" (mark of value) to left. Rev. The Dioscuri, Castor and Pollux, on horseback right, both armed with spear pointed forward and surmounted by star, "Q· MARC" (MA ligate) and "ROMA" in linear frame below. Sydenham 396. Obverse dark encrustation, the reverse decent, technically Very Fine.