Watch List notes:

Q. Marcius Libo. AR Denarius, 148 BC. D/ Helmeted head of Roma right; behind, LIBO; before, X. R/ The Dioscuri galloping right; below, Q. MARC; in exergue, ROMA. Cr. 215/1. B. 8. AR. g. 3.78 mm. 20.00 Well centred on a broad flan and prettily toned. Fields somewhat rough, otherwise about EF.