Watch List notes:

Roman republic. Denarius, uncertain mint circa 199-170, AR. Helmeted head of Roma r.; behind, X. Rev.: The Dioscuri galloping r.; below, ear and in exergue, ROMA. Sydenham 286. Crawford 170/1. 3.90 g. 18 mm. Very rare symbol and in exceptional condition for the issue. Iridiscent tone.