Watch List notes:

M. Papirius Carbo, Denarius, Rome, 122 BC; ; Helmeted head of Roma r.; behind, laurel branch; before, X, Rv. Jupiter in quadriga r., holding reins, sceptre and thunderbolt; below, M CAR[BO]; in ex. ROMA. Crawford 276/1; Papiria 6; Sydenham 423.
Lightly tone, good very fine.