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. GEL; in exergue, ROMA. Cr. 232/1; B. 1. AR. 3.74 g. 18.50 mm. Perfectly centred and lightly toned. VF.