Watch List notes:

Cn. Gellius. AR Denarius, 138 BC. Obv. Helmeted head of Roma right, X behind, all within laurel-wreath. Rev. Mars and Nerio in quadriga right; below horses, CN. GE[L]; in exergue, ROMA. Cr. 232/1. B.1. AR. g. 4.03 mm. 18.00 Good metal. Brilliant and superb. EF.