Date: 145 B.C.Denomination: AR Denarius.Diameter: 18 mm.Weight: 3.61 grams.Mint: Rome.
Obverse: Helmeted head of Roma right; to left, ass's head left; below chin, X (mark of value).Reverse: The Dioscuri, each holding spear, on horseback right.Reference: Crawford 220/1; Sydenham 408.